Commands tagged bash (821)
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file displays a files type the -L flag means follow sym-links (as libraries are often sym-linked to another this behavior is likely preferred) more complex behavior (*two* grep commands!) could be used to determine if the file is or is not a shared library.
-3file -L <library> | grep -q '64-bit' && echo 'library is 64 bit' || echo 'library is 32 bit' -
-3find /dev/ -name random -exec bash -c '[ -r $0 -a -w $0 ] && dd if=$0 | sort | dd of=$0' {} \;
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For those days when you need to know if something is happening because the day ends in "y". Show Sample Output
-3function ends_in_y() { if [ `date +%A | sed -e 's/\(^.*\)\(.$\)/\2/'` == "y" ]; then echo 1; else echo 0; fi } -
-3find . -type f -exec chmod a-x {} \;
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-3alias ping='ping -n'
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The same thing using only Bash built-in's. For readability I've kept the variables out, but it could me made extremely more compact (and totally unreadable!) by stuffing everything inside the single echo command.
-3IFS=$'\n'; LIST=`ls -1`; let TOT=`echo $LIST | wc -w`-1 ; array=($LIST); echo "Selected ${array[ ($RANDOM % $TOT) ]}" -
-3MyVAR=84; awk '{ print "'"$MyVAR"'" }'
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no need for seq or eval
-3mkdir ${1..10} -
For those files in current folder that would be shown in `ls *ext`, for some extension ext, move/rename that file removing the .ext suffix from the file name. It uses Bash's parameter substitution, as seen in http://tldp.org/LDP/abs/html/parameter-substitution.html#PCTPATREF (for analog use in prefix, see http://tldp.org/LDP/abs/html/parameter-substitution.html#PSOREX2 )
-3for i in *ext; do mv $i ${i%.ext}; done -
-3hex() { echo $1 16op | dc; }
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Will move in that case every file in the current folder older than 30 days to the "old" folder Replace "mv $i old/" by any command such as rm / echo to do something different.
-3for i in $(find . -mtime +30); do mv $i old/; done -
-4export IFS=$'\n';for dir in $( ls -l | grep ^d | cut -c 52-);do du -sh $dir; done
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After a command is run in bash, !$ is set to the last (space-delimited) argument of the command. Great for running several commands against the same file in a row.
-4svn status app/models/foo.rb; svn commit -m "Changed file" !$ -
how to finish command or script without any output Show Sample Output
-4read enterKey -
With counter format [001, 002, ..., 999] , nice with pictures or wallpapers collections.
-4for file in $(seq -f '%03.f' 1 $TOTAL ); do echo "($file/$TOTAL)"; curl -f -O http://domain.com/Name_$file.ext; done -
the last person who posted used the most roundabout way to concatinate files, there's a reason there's a "conCATinate" command... Using this method, you also get to choose the order of the files, below another person just did *.txt > combined.txt which is fine but the order depends on the implementation of "cat" which is probably alphabetical order of filenames. Show Sample Output
-4cat file1 ... fileN > combinedFile; -
-4scp $user@$server:$path/to/file .
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Writes out the shebang line (#!/bin/bash) to the script.
-4echo '#!'$(which bash) > script.sh -
-4function mkdcd () { mkdir "$1" && cd "$1" }
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many have aliases like: alias ...="cd ../../" alias ....="cd ../../../" and so furth. ..() mitigates to need for those aliases, see sample output for an example # .. -> go up 1 directory # .. 4 -> go up 4 directories ..() { local DIR='' declare -i NUM=0 if [[ ${1} =~ ^[1-9][0-9]*$ ]] then while (( ${NUM} < ${1:-1} )) do DIR="${DIR}../" NUM=$(( ${NUM} + 1 )) done else DIR=.. fi cd "${DIR}" } Show Sample Output
-4[ ~/temp/foo/bar/baz ] $ .. 3 -
-5kill %1
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Credit goes to "eightmillion" Show Sample Output
-5removedir(){ read -p "Delete the current directory $PWD ? " human;if [ "$human" = "yes" ]; then [ -z "${PWD##*/}" ] && { echo "$PWD not set" >&2;return 1;}; rm -Rf ../"${PWD##*/}"/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; } -
Add an alias to your .bashrc that allows you to issue the command xkcd to view (with gwenview) the newest xkcd comic... I know there are thousands of them out there but this one is at least replete with installer and also uses a more concise syntax... plus, gwenview shows you the downloading progress as it downloads the comic and gives you a more full featured viewing experience.
-5echo alias xkcd="gwenview `w3m -dump http://xkcd.com/|grep png | awk '{print $5}'` 2> /dev/null" >> .bashrc -
-5while read col1 col23; do echo $col1; done < three-column.txt > first-column.txt
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KISS To get a random xkcd comic:
xdg-open http://dynamic.xkcd.com/random/comic/-5xdg-open http://xkcd.com/ - ‹ First < 30 31 32 33 >
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