I have a problem that writes information to stdout and stderr, and I need to grep through what's coming to stderr, while disregarding stdout. I can of course do it in 2 steps: command > /dev/null 2> temp.file grep 'something' temp.file but I would prefer to be able to do is without temp files. Any smart piping trick? ...
I have a command which spouts a number of lines to stdout: $ listall foo bar baz How do I extract a random entry from this, in a one-liner (preferably without awk) so I can just use it in a pipe: $ listall | pickrandom | sed ... | curl ... Thanks! ...
Hi, I wonder the general rule to use regular expression in if clause in bash? Here is an example $ gg=svm-grid-ch $ if [[ $gg == *grid* ]] ; then echo $gg; fi svm-grid-ch $ if [[ $gg == ^....grid* ]] ; then echo $gg; fi $ if [[ $gg == ....grid* ]] ; then echo $gg; fi $ if [[ $gg == s...grid* ]] ; then echo $gg; fi $ ...
I have a bash code (Mybash1.sh) where the result I need to pass to another bash code (Mybash2.sh) that contain Python Here are the codes. Mybash1.sh #! /bin/bash # Mybash1.sh cut -f1,3 input_file.txt | sort | ./Mybash2.sh Mybash2.sh is this: #! /bin/bash #Mybash2.sh python mycode.py foo.txt <("$@") > output.txt # do something for...
i have a bash script that builds a string to run as a command the script: #! /bin/bash matchdir="/home/joao/robocup/runner_workdir/matches/testmatch/" teamAComm="`pwd`/a.sh" teamBComm="`pwd`/b.sh" include="`pwd`/server_official.conf" serverbin='/usr/local/bin/rcssserver' cd $matchdir illcommando="$serverbin include='$include' server...
I am trying to include this du -s *|awk '{ if ($1 > 3000) print }' in a shell script, but I want to parameterize the 3000. However, since the $1 is already being used, I'm not sure what to do. This was a total failure: size=$1 du -s *|awk '{ if ($1 > $size) print }' How can I pass a parameter in place of 3000 in the first script ab...
Hello, I'm not sure how to do an if with multiple tests in shell, I'm having trouble writing this script: echo "You have provided the following arguments $arg1 $arg2 $arg3" if [ "$arg1" = "$arg2" && "$arg1" != "$arg3" ] then echo "Two of the provided args are equal." exit 3 elif [ $arg1 = $arg2 && $arg1 = $arg3 ] then echo "...
I would like to call a Python script from within a Bash while loop. However, I do not understand very well how to use appropriately the while loop (and maybe variable) syntax of the Bash. The behaviour I am looking for is that, while a file still contains lines (DNA sequences), I am calling a Python script to extract groups of sequences ...
I'm trying to get a float number from this : totalmark=$(expr $sum / $subjects ) Is this correct? ...
Here's one for the bash-fu wizards. No, actually, I'm just kidding, you'll all probably know this except for me.. I'm trying to create a backup shell script. The idea is fairly simple: find files in a certain folder, older than 7 days, tar/gzip them to another directory, and remove them. The problem is, I'm not sure if I'll have enough ...
I want to write a Bash-Script which loggs into several machines via ssh and first shows their hostname and the executes a command (on every machine the same command). The hostname and the output of the command should be displayed together. I wanted a parallel version, so the ssh-commands should be run in background and in parallel. I co...
I'm switching from a Windows PHP-specific editor to VIM, on the philosophy of "use one editor for everything and learn it really well." However, one feature I liked in my PHP editor was its "find and replace" capability. I could approach things two ways: Just find. Search all files in a project for a string, see all the occurrences li...
I want to cat an apache log and then output the result to a file. I want to match the day/month with the Apache log to the current/previous date, however I seem to be doing this incorrectly. Sample from apache log: 62.173.92.62 - - [02/Mar/2010:15:46:58 +0000] "GET /img....... Current script: cat access_log | grep "\[+%d+/%b" > email....
I honestly can't believe I can't find a solution for this online. I've run across a few things that seem similar, but nothing that really does what I want... I'm trying to use a shell script to start a command. I don't care if/when/how/why it finishes. I want the process to start and run, but I want to be able to get back to my shell im...
How could I track changes of specific directory in UNIX? For example, I launch some utility which create some files during its execution. I want to know what exact files were created during one particular launch. Is there any simple way to get such information? Problem is that: I cannot flush directory content after script execution Fi...
Hey, I would like to know if its possible to do formatting using echo in shell scripting. Here is a small code snippet which is giving me the problem echo -en "\rFileName : $filename : $index of $lines Completed" The Filename's is a string with varying length and this is causing problem with formating in the terminal. How ...
I need a shell command or script that converts a UNIX timestamp to a date. The input can come either from the first parameter or from stdin, allowing for the following usage patterns: ts2date 1267619929 and echo 1267619929 | ts2date Both commands should output "Wed Mar 3 13:38:49 2010". ...
Objective Change these filenames: F00001-0708-RG-biasliuyda F00001-0708-CS-akgdlaul F00001-0708-VF-hioulgigl to these filenames: F0001-0708-RG-biasliuyda F0001-0708-CS-akgdlaul F0001-0708-VF-hioulgigl Shell Code To test: ls F00001-0708-*|sed 's/\(.\).\(.*\)/mv & \1\2/' To perform: ls F00001-0708-*|sed 's/\(.\).\(.*\)/mv & \...
Hello , I'm trying to assign the output of this command ( that is in my makefile ) to the makefile HEADER var like in this following line of code: HEADER = $(shell for file in `find . -name *.h`;do echo $file; done) The problem is that if I print HEADER in my makefile using: print: @echo $(HEADER) I get ile ile ile ile ile il...