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  • Iterating over each line of ls -l output

    - by Ivan
    I want to iterate over each line in the output of ls -l /some/dir/* Right now I'm trying: for x in ls -l $1; do echo $x done, however this iterates over each element in the line seperately, so i get -r--r----- 1 ivanevf eng 1074 Apr 22 13:07 File1 -r--r----- 1 ivanevf eng 1074 Apr 22 13:17 File2 I want to iterate over each line as a whole, though. How do I do that? Thanks.

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  • shell script filter du and find by a string inside a file in a subfolder

    - by Jason
    I have the following command that I run on cygwin: find /cygdrive/d/tmp/* -maxdepth 0 -mtime -150 -type d | xargs du --max-depth=0 > foldersizesreport.csv I intended to do the following with this command: for each folder under /d/tmp/ that was modified in last 150 days, check its total size including files within it and report it to file foldersizesreport.csv however that is now not good enough for me, as it turns out inside each /d/tmp/subfolder1/somefile.properties /d/tmp/subfolder2/somefile.properties /d/tmp/subfolder3/somefile.properties /d/tmp/subfolder4/somefile.properties so as you see inside each subfolderX there is a file named somefile.properties inside it there is a property SOMEPROPKEY=3808612800100 (among other properties) this is the time in millisecond, i need to change the command so that instead of -mtime -150 it will include in the whole calculation only subfolderX that has a file inside them somefile.properties where the SOMEPROPKEY=3808612800100 is the time in millisecond in future, if the value SOMEPROPKEY=23948948 is in past then dont at all include the folder in the foldersizesreport.csv because its not relevant to me. so the result report should be looking like: /d/tmp/,subfolder1,<itssizein KB> /d/tmp/,subfolder2,<itssizein KB> and if subfolder3 had a SOMEPROPKEY=34243234 (time in ms in past) then it would not be in that csv file. so basically I'm looking for: find /cygdrive/d/tmp/* -maxdepth 0 -mtime -150 -type d | <only subfolders that have in them property in file SOMEPROPKEY=28374874827 - time in ms in future and not in past | xargs du --max-depth=0 > foldersizesreport.csv

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  • LBA48 in Linux SCSI ATA Passthrough

    - by Ben Englert
    I am writing a custom disk monitoring/diagnostics app which, among other things, needs to do stuff to SATA disks behind a SAS PCI card under Linux. So far I am following this guide as well as the example code in sg_utils to pass ATA taskfiles through the SCSI layer. Seems to be working okay. However, in both cases, the CDB data structure (pointed to by the cmdp member of the sg_io argument to the ioctl) has only one unsigned char worth of space for the number of sectors. If you look at the ata_taskfile structure in linux\ata.h you'll see that it has an "nsect" and a "hob_nsect" field - high order bits for the sector count, to support LBA48. It turns out that in my application I need LBA48 support. So, anyone know how to set up an sg_io_hdr structure with an LBA48 sector count?

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  • Linux Kernel - Adding field to task_struct

    - by Drex
    I'm playing around with the linux kernel and added a struct field to the task_struct in sched.h. I know that can be costly but my struct is very small. I then initialize the new struct in INIT_TASK() and also re-initialize in fork.c copy_process() function so that when the INIT task or any other task creates a new process the process gets the init values. What then happens is when I try to run the kernel I get a SEGFAULT. The gdb error is: Locating the bottom of the address space ... Program received signal SIGSEGV, Segmentation fault. 0x08066ad7 in page_ok (page=) at arch/um/os-Linux/sys-i386/task_size.c:31 31 n = *address; It looks like it fails out in task_size. Is there anything else I need to do to add a field to task_struct?

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  • How to store and echo multiple lines elegantly in bash?

    - by EmpireJones
    I'm trying to capture a block of text into a variable, with newlines maintained, then echo it. However, the newlines don't seemed to be maintained when I am either capturing the text or displaying it. Any ideas regarding how I can accomplish this? Example: #!/bin/bash read -d '' my_var <<"BLOCK" this is a test BLOCK echo $my_var Output: this is a test Desired output: this is a test

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  • How to warn for the use of unset variables in a korn shell script

    - by Lepu
    Is there any way to throw errors or warnings in a korn shell script to prevent the use of unset variables ? Let's assume I have a temporary folder that I want to remove. TEMP_FILES_DIR='/app/myapp/tmp' rm -Rf $TEMP_FILE_DIR #notice the misspelling How to prevent this kind of mistakes before they actually happen? I know the script should check for file existence and empty string before attempting to remove, this is just a silly example to illustrate a mistake that could have been avoided with some warnings. I don't know if this feature exists in ksh. If it does exist, how do you turn it on?

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  • compare time using date command

    - by Andrei
    Say I want a certain block of bash script execute only if it is between 8 am (8:00) and 5 pm (17:00), and do nothing otherwise. The script is running continuously So far I am using date command. How to use it compare it current time within the range? Thanks

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  • Available IDE for CLI only Debian Linux distro

    - by ultrajohn
    Hi Guys! I don't know if I am being clear with my question. I would like to ask for suggestions on the available IDEs that you I use in a command line interface (CLI) only linux distro. I am using debian. I want to program in C or C++ and I could not start because I dont have an ide or just a simple text editor. I don't have an idea how to save a file created using 'edit' since it is also my first time working in a linux enviroment. I hope you understand me. Thanks a lot!

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  • How can I quickly sum all numbers in a file?

    - by Mark Roberts
    I have a file which contains several thousand numbers, each on it's own line: 34 42 11 6 2 99 ... I'm looking to write a script which will print the sum of all numbers in the file. I've got a solution, but it's not very efficient. (It takes several minutes to run.) I'm looking for a more efficient solution. Any suggestions?

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  • Run FFmpeg from Shell Script

    - by Abs
    Hello all, I have found a useful shell script that shows all files in a directory recursively. Where it prints the file name echo "$i"; #Display File name. I would instead like to run an ffmpeg command on non MP3 files, how can I do this? I have very limited knowledge of shell scripts so I appreciate if I was spoon fed! :) //if file is NOT MP3 ffmpeg -i [the_file] -sameq [same_file_name_with_mp3_extension] //delete old file Here is the shell script for reference. DIR="." function list_files() { if !(test -d "$1") then echo $1; return; fi cd "$1" echo; echo `pwd`:; #Display Directory name for i in * do if test -d "$i" #if dictionary then list_files "$i" #recursively list files cd .. else echo "$i"; #Display File name fi done } if [ $# -eq 0 ] then list_files . exit 0 fi for i in $* do DIR="$1" list_files "$DIR" shift 1 #To read next directory/file name done

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  • Regarding Shell variable

    - by arav
    I need to call another shell script testarg.sh within my main script. This script testarg.sh has arguments ARG1 ,ARG2, ARG3. I need to call up the below way ./testarg.sh -ARG1 -ARG2 -ARG3 ARG1 and ARG3 argument Variables are mandatory ones. If its not passed to the main script then i quit. ARG2 is an optional one. If the ARG2 variable is not set with value or it's not defined then i need not pass it from main script.So i need to call up the below way ./testarg.sh -ARG1 -ARG3 If the value exist for the ARG2 Varibale then i need to call the below way ./testarg.sh -ARG1 -ARG2 -ARG3 Do i need to have a if else statement for checking the ARG2 variable is empty or null. Is there any other way to do it.

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  • Import C + Makefile into a linux IDE?

    - by Jessica
    I have a project for Linux that i've been developing for some time. Basically it's a bunch of C and H files together with a directory structure and a Makefile. Every time I need to debug something it's so painful, I need to manually search for var. definitions, structs, etc. Is there any good IDE out there for Linux that will allow me to import those files into a "project" and that will provide code completion or at least an easy way to get my bearings in the source code? thanks!

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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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  • 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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  • 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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  • Random password variable disappears

    - by snaken
    Hi, I'm using the following to generate a random password in a shell script: DBPASS=</dev/urandom tr -dc A-Za-z0-9| (head -c $1 > /dev/null 2>&1 || head -c 8) When i run this in a file on its own like this: #!/bin/sh DBPASS=</dev/urandom tr -dc A-Za-z0-9| (head -c $1 > /dev/null 2>&1 || head -c 8) echo $DBPASS A password is echoed. When i incorporate it into a larger script though the variable never seems to get created for some reason, so for example this doesn't work: DBPASS=</dev/urandom tr -dc A-Za-z0-9| (head -c $1 > /dev/null 2>&1 || head -c 8) sed -i s/oldpass/$DBPASS/ mysql_connect.php If i manually set the variable though everything is fine.. can anyone see why?

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