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  • Conflict between variable substitution and CJK characters in BASH

    - by AndreasT
    I encountered a problem with variable substitution in the BASH shell. Say you define a variable a. Then the command $> echo ${a//[0-4]/} prints its value with all the numbers ranged between 0 and 4 removed: $> a="Hello1265-3World" $> echo ${a//[0-4]/} Hello65-World This seems to work just fine, but let's take a look at the next example: $> b="?1265-3?" $> echo ${b//[0-4]/} ?1265-3? Substitution did not take place: I assume that is because b contains CJK characters. This issue extends to all cases in which square brackets are involved. Surprisingly enough, variable substitution without square brackets works fine in both cases: $> a="Hello1265-3World" $> echo ${a//2/} Hello165-3World $> b="?1265-3?" $> echo ${b//2/} ?165-3? Is it a bug or am I missing something? I use Lubuntu 12.04, terminal is lxterminal and echo $BASH_VERSION returns 4.2.24(1)-release. EDIT: Andrew Johnson in his comment stated that with gnome-terminal 4.2.37(1)-release the command works fine. I wonder whether it is a problem of lxterminal or of its specific 4.2.24(1)-release version.

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  • Bash script using eyeD3 to remove extra tags from mp3 files

    - by jaguare22
    I found what looks like the perfect script for this but getting errors. Hoping someone can see problem. I am running 12.04 Server. Error is - awk: line 0: regular expression compile failed (missing '(') ): awk: line 0: regular expression compile failed (missing '(') ) The following tags have been found in the mp3s: These tags are to be stripped: Here is a the script obtained from savvyadmin !/bin/bash Script name: strip-tags.sh Original Author: Ian of DarkStarShout Blog Site: http://darkstarshout.blogspot.com/ Options slightly modified to liking of SavvyAdmin.com oktags="TALB APIC TCON TPE1 TPE2 TPE3 TIT2 TRCK TYER TCOM TPOS" indexfile=mktemp Determine tags present: find . -iname "*.mp3" -exec eyeD3 --no-color -v {} \; $indexfile tagspresent=sort -u $indexfile | awk -F\): '/^<.*$/ {print $1}' \ | uniq | awk -F\)\> '{print $1}' | awk -F\( '{print $(NF)}' \ | awk 'BEGIN {ORS=" "} {print $0}' rm $indexfile Determine tags to strip: tostrip=echo -n $tagspresent $oktags $oktags \ | awk 'BEGIN {RS=" "; ORS="\n"} {print $0}' | sort | uniq -u \ | awk 'BEGIN {ORS=" "} {print $0}' Confirm action: echo echo The following tags have been found in the mp3s: echo $tagspresent echo These tags are to be stripped: echo $tostrip echo echo -n Press enter to confirm, or Ctrl+C to cancel... read dummy Strip 'em stripstring=echo $tostrip \ | awk 'BEGIN {FS="\n"; RS=" "} {print "--set-text-frame=" $1 ": "}' First pass copies any v1.x tags to v2.3 and strips unwanted tag data. Second pass removes v1.x tags, since I don't like to use them. Without --no-tagging-time-frame, a new unwanted tag is added. :-) find . -iname "*.mp3" \ -exec eyeD3 --to-v2.3 --no-tagging-time-frame $stripstring {} \; \ -exec eyeD3 --remove-v1 --no-tagging-time-frame {} \; echo "Script complete!"

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  • Bash Script help required

    - by Sunil J
    I am trying to get this bash script that i found on a forum to work. Copied it to text editor. Saved it as script.sh chmod 700 and tried to run it. rootdir="/usr/share/malware" day=`date +%Y%m%d` url=`echo "wget -qO - http://lists.clean-mx.com/pipermail/viruswatch/$day/thread.html |\ awk '/\[Virus/'|tail -n 1|sed 's:\": :g' |\ awk '{print \"http://lists.clean-mx.com/pipermail/viruswatch/$day/\"$3}'"|sh` filename=`wget -qO - http://lists.clean-mx.com/pipermail/viruswatch/$day/thread.html |\ awk '/\[Virus/'|tail -n 1|sed 's:": :g' |awk '{print $3}'` links -dump $url$filename | awk '/Up/'|grep "TR\|exe" | awk '{print $2,$8,$10,$11,$12"\n"}' > $rootdir/>$filename dirname=`wget -qO - http://lists.clean-mx.com/pipermail/viruswatch/$day/thread.html |\ awk '/\[Virus/'|tail -n 1|sed 's:": :g' |awk '{print $3}'|sed 's:.html::g'` rm -rf $rootdir/$dirname mkdir $rootdir/$dirname cd $rootdir grep "exe$" $filename |awk '{print "wget \""$5"\""}' | sh ls *.exe | xargs md5 >> checksums mv *.exe $dirname rm -r $rootdir/*exe* mv checksums $rootdir/$dirname mv $filename $rootdir/$dirname I get the following message.. script.sh: line 11: /usr/share/malware/: Is a directory script.sh: line 11: links: command not found

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  • Bash script runs fine, but not in cron

    - by radiotech
    I have a script that's supposed to record a shoutcast stream for an hour, convert it to mp3, and then save it. The script runs correctly when I run it from the terminal, but I can't seem to get it to run in cron (where it should run every hour at the top of the hour). Here's the line in crontab: 0 * * * * /medialib/tech/bin/recordstream 2>&1 >> /medialib/tech/cron.log and here's the script: #!/bin/bash name="$(date +%s)" mp3_name=$name.mp3 wav_name=$name.wav timeout -sHUP 60m vlc -I dummy --sout "#transcode{channels=2}:std{access=file,mux=wav,dst=/medialib/stream_backup/wav/$wav_name" /medialib/tech/lib/listen.m3u lame --mp3input /medialib/stream_backup/wav/$wav_name /medialib/stream_backup/$mp3_name rm /medialib/stream_backup/wav/$wav_name Thank you! EDIT: Contents of cron.log (This text has been in the log file since it was transferred from an old server where it was working). VLC media player 2.0.8 Twoflower Command Line Interface initialized. Type `help' for help. > Shutting down. VLC media player 2.0.8 Twoflower Command Line Interface initialized. Type `help' for help. > Shutting down.

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  • How can I uniqely record every new command I use, and possibly timestamp it?

    - by Nirmik
    I've been on Linux for more than 6 months now but never went too much into the CLI (command-line interface or terminal or shell) Now as I ask questions here, get answers, or help from other sites, I learn new commands... How can I can store every new command in a text file? Only new/*unique* commands, not repetitions of the same command. Here's an example: In the terminal, I enter the commands like this- ubuntu@ubuntu:~$ *command1* ubuntu@ubuntu:~$ *command2* ubuntu@ubuntu:~$ *command3* ubuntu@ubuntu:~$ *command4* ubuntu@ubuntu:~$ *command1* Now, these commands should get saved in a text file say commandrec like this- *command1* *command2* *command3* *command4* NOTE:The last command in the terminal which was again command1 is not recorded/saved again in the text file. And the next time I open the terminal, and enter a new command command 5, it should get appended to the list in commandrec (but if the command was used earlier on some other date, it should still be ignored. For example, command 1 entered again along with command 5 on a new day/time but command1 not recorded as already used) The commandrec file looking something like this- 31/05/12 12:00:00 *command1* *command2* *command3* *command4* 01/06/12 13:00:00 *command 5* (the time and date thing would be great if possible, but okay even if that isn't there) This way, I can have a record of all commands used by me to date. How can this be done?

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  • Bash arrays and case statements - review my script

    - by Felipe Alvarez
    #!/bin/bash # Change the environment in which you are currently working. # Actually, it calls the relevant 'lettus.sh' script if [ "${BASH_SOURCE[0]}" == "$0" ]; then echo "Try running this as \". chenv $1\"" exit 0 fi usage(){ echo "Usage: . ${PROG} -- Shows a list of user-selectable environments." echo " . ${PROG} [env] -- Select environment." echo " . ${PROG} -h -- Shows this usage screen." return } showEnv(){ # check if index0 exists, assume we have at least the first (zeroth) element #if [ -z "${envList}" ]; then if [ -z "${envList[0]}" ]; then echo "array \$envList is empty! " >&2 return 1 fi # Show all elements in array (0 -> n-1) for i in $(seq 0 $((${#envList[@]} - 1))); do echo ${envList[$i]} done return } setEnv(){ if [ -z "$1" ]; then usage; return fi case $1 in cold) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_cold.sh;; coles) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_coles.sh;; fc) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_fc.sh;; fcrm) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_fcrm.sh;; stable) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_stable.sh;; tip) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_tip.sh;; uat) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_uat.sh;; wellmdc) FILE_TO_SOURCE=/u2/tip/conf/ctrl/lettus_wellmdc.sh;; *) usage; return;; esac if $IS_SOURCED; then echo "Environment \"$1\" selected." echo "Now sourcing file \"$FILE_TO_SOURCE\"..." . ${FILE_TO_SOURCE} return else return 1 fi } main(){ if [ -z "$1" ]; then showEnv; return fi case $1 in -h) usage;; *) setEnv $1;; esac return } PROG="chenv" # create array of user-selectable environments envList=( cold coles fc fcrm stable tip uat wellmdc ) main "$@" return If I could, I'd like to get some feedback on a better way to accomplish any of the following: run through the case statement make script trivally simple to maintain/upgrade/update

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  • How to create (via installer script) a task that will install my bash script so it runs on DE startup?

    - by MountainX
    I've been reading for the last couple hours about Upstart, .xinitrc, .xsessions, rc.local, /etc/init.d/, /etc/xdg/autostart, @reboot in crontab and so many other things that I'm totally confused! Here is my bash script. It should start/run after the desktop environment is started and it should continue to run at all times until logout/shutdown. It should start again on reboot. Any time the DE is running, it should run. #!/bin/bash while true; do if [[ -s ~/.updateNotification.txt ]]; then read MSG < ~/.updateNotification.txt kdialog --title 'The software has been updated' --msgbox "$MSG" cat /dev/null > ~/.updateNotification.txt fi sleep 3600 done exit 0 I know zero about using Upstart, but I understand that Upstart is one way to handle this. I'll consider other approaches but most of the things I've been reading about are too complex for me. Furthermore, I can't figure out which approach will meet my requirements (which I'll detail below). There are two steps in my question: How to automatically start the script above, as described above. How to "install" that Upstart task via a bash script (i.e., my "installer"). I assume (or hope) that step 2 is almost trivial once I understand step 1. I have to support all flavors of Ubuntu desktops. Therefore, the kdialog call above will be replaced. I'm considering easybashgui for this. (Or I could use zenity on gnome DE's.) My requirements are: The setup process (installation) must be done via a bash script. I cannot use the GUI method described in the Ubuntu doc AddingProgramToSessionStartup, for example. I must be able to script/automate the setup (installing) process using bash. Currently, it is as simple as having the bash installer script copy the above script into /home/$USER/.kde/Autostart/ The setup process must be universal across Ubuntu derivatives including Unity and KDE and gnome desktops. The same setup script (installer) should run on Linux Mint, Kubuntu, Xbuntu (basically any flavor of Ubuntu and major derivatives such as Linux Mint). For example, we cannot continue to put a script file in /home/$USER/.kde/Autostart/ because that exists only on KDE. The above script should work for each of the limited flavors we use. Hence our interest in using easybashgui instead of kdialog or zenity. See below. The installed monitoring script should only be started after the desktop is started since it will display a GUI message to the user if the update is found. The monitoring script (above) should run without root privileges, of course. But the installer (bash script) can be run as root. I'm not a real developer or a sysadmin. This is a part time volunteer thing for me, so it needs to be easy/simple. I can write bash scripts and I can program a little, but I know nothing about Upstart or systemd, for example. And, unfortunately, my job doesn't give me time to become an expert on init systems or much of anything else related to development and sysadmin. So I have to stick with simple solutions. The easybashgui version of the script might look like this: #!/bin/bash source easybashgui while true; do if [[ -s ~/.updateNotification.txt ]]; then read MSG < ~/.updateNotification.txt message "$MSG" cat /dev/null > ~/.updateNotification.txt fi sleep 3600 done exit 0

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  • change from bash shell prompt to regular shell prompt on centos

    - by user881480
    my centos environment has just become bash shell prompt: -bash-3.2# how do I change it back to the usual # prompt? what places should I check for possibly modifications? Update: I was not clear in my question: the prompt used to be just a single # and supports more syntax(a different shell script than bash 3.2 perhaps)? I would like to switch back to that. for example, ll is not longer supported in this bash shell

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  • confused about variables in bash

    - by gappy
    I know that variables in bash have no type, but am confused about the value they are assigned. The following simple script works fine in bash #!/bin/bash tail -n +2 /cygdrive/c/workdir\ \(newco\,\ LLC\)/workfile.txt > \ /cygdrive/c/workdir\ \(newco\,\ LLC\)/workfile2.txt However, the following does not #!/bin/bash tmpdir=/cygdrive/c/workdir\ \(newco\,\ LLC\) tail -n +2 $tmpdir/workfile.txt > $tmpdir/workfile2.txt Is there an explanation for this behavior?

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  • bash one-liner loop over directories throws errors

    - by cori
    I'm trying to build a bash one-liner to loop over the directories within the current directory and tar the content into unique tars, using the directory name as the tar file name. I've got the basics working (finding the directory names, and tarring them up with those names) but my loop tosses some error messages and I can't understand where it's getting the commands its trying to run. Here's the mostly-working one-liner: for f in `ls -d */`; do `tar -czvvf ${f%/}.tar.gz $f`;done The "strange" output is: -bash: drwxrwxr-x: command not found -bash: drwxr-xr-x: command not found -bash: drwxr-xr-x: command not found -bash: drwxrwxr-x: command not found What portion of the command that I'm running do I not understand and that's generating that output?

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  • seeking to upgrade my bash magic. help decipher this command: bash -s stable

    - by tim
    ok so i'm working through a tutorial to get rvm installed on my mac. the bash command to get rvm via curl is curl -L https://get.rvm.io | bash -s stable i understand the first half's curl command at location rvm.io, and that the result is piped to the subsequent bash command, but i'm not sure what that command is doing. My questions: -s : im always confused about how to refer to these. what type of thing is this: a command line argument? a switch? something else? -s : what is it doing? i have googled for about half an hour but not sure how to refer to it makes it difficult. stable : what is this? tl;dr : help me decipher the command bash -s stable to those answering this post, i aspire to one day be as bash literate as you. until then, opstards such as myself thank you for the help!

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  • How to boot RHEL with no bash?

    - by nmelmun
    How can I boot a RHEL VM if I deleted /bin/bash? When trying to boot, I now get the following error: "INIT: Cannot execute "/etc/rc/d/rc.sysinit" The next thing I tried was to modify the kernel boot parameters by adding init=/bin/ksh at the end of the line, which gave me a functional shell. After this, in order to get write permissions, I remounted the root partition with: mount -o remount,rw / Then I tried to boot using ksh as the shell by tricking the system into thinking it's bash: ln -s /bin/ksh /bin/bash Then restarted the system normally. Unfortunately this didnt work since ksh is not compatible and /etc/rc.d/rc.sysinit uses several bash-specific tricks. Does anyone else have a suggestion on how I could get the system to boot normally without reinstalling bash?

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  • Why is sudo bash different from regular bash

    - by cyberjar09
    Problem description : I am using something called play framework in my development which requires me to make the python script play available in the path. Hence I create a symbolic link in /usr/local/bin ... Now I have written a shell script (call it status.sh) which calls this python script as follows : play status <some values here related to my app> &> /tmp/xyz.txt and this shell script then sends me the file via email. This works perfectly when I execute the script as follows ./script.sh. However when the script is executed as a cron expression everyday I get an output from stderr saying 'play: command not found'. Hence I did some digging on my own and here are my findings : echo $PATH when I am on the shell shows that I have /usr/local/bin available to me hence I can successfully execute the command play status however when I type in sudo bash and then echo $PATH I do not have the path /usr/local/bin anymore. It is a limited set of folders (one of them being /usr/bin). Q : Why this behavior ?! I fail to understand why the path is different. Also as a workaround would you suggest I do : new symbolic link from /usr/bin to /usr/local/bin (what are the side effects of this?) remove /usr/local/bin sym link altogether and only use /usr/bin is there a convention that I am not following here for linking new programs and executing them from $PATH ? Thanks.

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  • Bash: command not found

    - by Alexandre Teles
    I have a script that needs to know the processor architecture. I'm doing this way: if [["$(uname -m)" = "x86_64"]]; then wget https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm else echo "Nossa! Você só pode usar 3,5GB de memória RAM. Que triste :( Vou baixar a versão 32bits pra você tá?" wget https://dl.google.com/linux/direct/google-chrome-stable_current_i386.rpm fi But when I execute the code, I receive: instala_chrome.sh: line 35: [[x86_64: command not found Anyone can help me to solve this? Thanks!

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  • bash command for each file in a folder

    - by Robert
    I have a set of files on which I would like to apply the same command and the output should contain the same name as the processed file but with a different extension. Currently I am doing rename /my/data/Andrew.doc to /my/data/Andrew.txt I would like to do this for all the .doc files from the /my/data/ folder and to preserve the name. I tried several versions but I guess I have something wrong in the syntax as I an new to linux.

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  • Unable to set background image using python (2.7.3), bash and gnome3

    - by malon
    #!/usr/bin/env python import os bashCommand = "gsettings set org.gnome.desktop.background picture-uri file:///home/malon/autowallpaperchanger/" + pic_name print bashCommand os.system(bashCommand) Print result: gsettings set org.gnome.desktop.background picture-uri file:///home/malon/autowallpaperchanger/wallpaper-1252048.jpg Copying and pasting the print result into a terminal makes the change successfully, so the command is correct, but os.system isn't processing the request correctly for some reason. In the full script (posted below), I use os.system for a different reason immediately before (wget) and that works fine. Thank you! Full script: http://pastebin.com/R90GTmBZ

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  • Bash prompt doesn't print until I interact with console again

    - by durron597
    I don't even know where to begin to diagnose this one. Usually, when a command finishes, the prompt prints itself for the next command. However, that is not happening. Hard to explain with words, I'll just use an example: User@Machine:~$ cp /mnt/mountname/directory/textfile.txt . After waiting several seconds (far too long for this operation on a small file) I press Enter, and see: User@Machine:~$ cp /mnt/mountname/directory/textfile.txt . User@Machine:~$ User@Machine:~$ So clearly the operation had finished, but the prompt didn't display... until I pressed enter, and then BOTH prompts instantly displayed. This error does not happen with commands like cd.

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  • bash dirtrim produces strange results with ~/foo/bar/var directory

    - by queueoverflow
    In some of my projects, I keep a var or a lib folder for runtime output and external libraries. To keep my prompt rather short, I have the export PROMPT_DIRTRIM=3 option in my .bashrc. This works very well for most paths, but as soon as I have a /var in there, it goes nuts like this (for ~/Projects/someproject/var/gfx): ~/.../gfxr/gfxr/gfxr/gfxr/gfxr/gfx Interestingly, it works with /opt/lampp/lib Is there some way to get around this? Update my .bashrc my .bash_functions

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  • OS evaluate in bash script

    - by moata_u
    i was thinking in way that before run my script , evaluate which operating system that user use ubuntu or solaris , am using this because there is some differences in command option in each OS such as sed .. , i was trying the following : sysEval=`grep "ubuntu" | uname -a` if [ sysEval ]; then .......some command else ....... some command fi NOTE That my script will run only in ubuntu or solaris seems not working !

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  • How to extract a record in a text on string match in a file using bash

    - by private
    Hi I have a text file sample.txt as =====record1 title:javabook price:$120 author:john path:d: =====record2 title:.netbook author:paul path:f: =====record3 author:john title:phpbook subject:php path:f: price:$150 =====record4 title:phpbook subject:php path:f: price:$150 from this I want to split the data based on author, it should split into 2 files which contains test1.txt =====record1 title:javabook price:$120 author:john path:d: =====record3 author:john title:phpbook subject:php path:f: price:$150 and test2.txt =====record2 title:.netbook author:paul path:f: like above I want to classify the main sample.txt file into sub files based on author field dynamically. Please suggest me a way to do it.

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  • Anomaly with bash PS1 definition

    - by Michael Wiles
    My root and admin user both have the same .bashrc file. The prompt section of the .bashrc is the following: if [ "$color_prompt" = yes ]; then PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ ' else PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ ' fi unset color_prompt force_color_prompt # If this is an xterm set the title to user@host:dir case "$TERM" in xterm*|rxvt*) PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1" ;; *) ;; esac But the problem is that the admin user and root user have different prompts. admin's prompt is: admin@hostname:~$ and root's prompt is root@hostname:/home# So it seems root is using the "xterm" version and admin is not. Why does the .bashrc file have this difference in prompts? How do I get the admin user to also use the xterm version? How would I test that condition? If I run echo $TERM while running as the admin user I get xterm so as far as I can tell, it should be using the xterm version for the admin user.

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  • bash profile works for user but not sudo

    - by user564448
    I've modified my .profile to include a folder if a flash drive is plugged in. When running the command as the user it works fine but tells me the scrip must be run by sudo (this is what i want). However, when i try to run it with sudo i get "command not found" I have a symlink (flash) in my /var/www folder pointing to my /media/flash drive. (nevermind this setup since is just for dev) this is my user's .profile : # set PATH so it includes flash scripts if [ -d "/var/www/flash/scripts" ] ; then PATH="/var/www/flash/scripts:$PATH" fi when trying to run as sudo i get: sudo: script: command not found any ideas?

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  • Bash command history not working

    - by user12663
    The command history between sessions is not getting saved. I'm using guake and the history for the session is working fine. I noticed that .bash_history had some commands I executed in sudo -s mode and tried the same again and all the commands while in the session got saved so I tried chmod 777 .bash_history Now the old commands appear at the start of a session but no new commands are getting saved Thanx in advance

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  • How do I change bash history completion to complete what's already on the line?

    - by blokkie
    I found a command a couple of months ago that made my bash history auto-complete on what's already on the line when pressing the up arrow: $ vim fi Press ? $ vim file.py I'd like to set this up on my new computer, because it saves a lot of time when keeping a big history. The problem is that I can't for the life of me remember where it was mentioned and reading through endless bash references and tutorials unfortunately didn't help either. Does anybody know the command?

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  • Can't get expand_aliases to take effect

    - by sachmet
    I can't get expand_aliases to take effect in bash. I've tried a lot of different things, and nothing works. Here's the simple test case: /bin/bash -c 'shopt -s expand_aliases; alias cdtmp="cd /tmp"; alias; cdtmp; pwd;' And the output: $ /bin/bash -c 'shopt -s expand_aliases; alias cdtmp="cd /tmp"; alias; cdtmp; pwd;' alias cdtmp='cd /tmp' /bin/bash: cdtmp: command not found /home/user $ /bin/bash --version GNU bash, version 3.2.25(1)-release (i686-redhat-linux-gnu) Copyright (C) 2005 Free Software Foundation, Inc. (Yes, I'm using shopt instead of the -O option to bash, just to prove it's being done.) Any ideas?

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