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Replaces every ocurrence of 'old' for 'new' in all files specified. After the 'i' char you can put a '~' or whatever to create a backup file for each replaced with the name equal to the original plus character.
0perl -i -pe "s/old/new/g" * -
just for fun
14yes "$(seq 232 255;seq 254 -1 233)" | while read i; do printf "\x1b[48;5;${i}m\n"; sleep .01; done -
846python -m SimpleHTTPServer
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0tar -tvjf backup.tar.bz2 | sort -nrk 3 | head
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Useful if you have to tunnel ssh through a local port and it complains of the host key being different. Much easier than manually editing the file.
9ssh-keygen -R \[localhost\]:8022 -
-3ps -auwx|egrep hunger|grep -v grep| awk '{print "kill -9",$1}' > ~/fu.bar
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Only excludes .svn from filenames. Show Sample Output
2alias rgrep="find . \( ! -name .svn -o -prune \) -type f -print0 | xargs -0 grep" -
51du -s * | sort -n | tail
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Open a terminal (urxvt in this case) to connect to a screen session (named "main") and create the screen session if necessary.
0screen -ls | grep main && urxvt -name screen -e screen -x main || urxvt -name screen -e screen -R -S main -
Ping machine once, waiting 1 second for response until failing. Upon fail, ssh globally, otherwise ssh locally.
1ping localip -c 1 -W 1 &> /dev/null && ssh localip || ssh globalip -
2apropos somekeyword
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4whereis somecommand
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Returns the pathnames of the files which would be executed in the current environment had its arguments been given as a command.
0which somecommand -
Variant of find grep that ignores files with .svn in the name. Useful for searching through a local repository of source code.
-2find . -type f -print0 | grep -vzZ '.svn' | xargs -0 grep --color -nEHi "SEARCHTERM" -
-1alias cdc='cd `pwd -P`'
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3alias beep='echo -en "\007"'
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3ssh somemachine "cd some dir; tar zcpf - somedirname" |tar zxpf -
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4alias counts=sort | uniq -c | sort -nr
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Replace and accordingly.
68mplayer -ao pcm -vo null -vc dummy -dumpaudio -dumpfile <output-file> <input-file> -
bash/ksh subshell redirection (as file descriptors) used as input to diff
100diff <(sort file1) <(sort file2) -
Good for one off jobs that you want to run at a quiet time. The default threshold is a load average of 0.8 but this can be set using atrun. Show Sample Output
45echo "rm -rf /unwanted-but-large/folder" | batch -
Useful in scripts when the file is passed in as an argument. Eg.
filepath=$(realpath $1)Show Sample Output7realpath examplefile.txt -
Useful for checking if there are differences between local and remote files.
176ssh user@host cat /path/to/remotefile | diff /path/to/localfile - -
This decompresses the file and sends the output to STDOUT so it can be grepped. A good one to put in loops for searching directories of gzipped files, such as man pages. Show Sample Output
-7zcat /usr/share/man/man1/grep.1.gz | grep "color" -
Useful for getting to know the available keyboard shortcuts. Show Sample Output
6bind -p | grep -F "\C" - ‹ First < 564 565 566 567 568 >
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