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Convert a decimal number to octal, hexadecimal, binary, or anything$ echo 'obase=2;1234' | bc |
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Convert from avi format to mp4 encoding$ ffmpeg -i file.avi file.mp4 |
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Format input into multiple columns, like a table, useful or pretty-printing$ mount | column -t |
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Function to extract columns from an input stream$ col() { awk '{print $'$(echo $* | sed -e 's/ /,$/g')'}'; } |
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Resize an image proportionally to some specified width or height$ mogrify -geometry x31 path/to/image.gif |
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Do something in another directory without going there$ (cd /path/to/somewhere; tar c .) > somewhere.tar |
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Remove carriage return '\r' character in many files, without looping and intermediary files$ recode pc..l1 file1 file2 file3 |
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Find the target path a symlink is pointing to$ readlink a_symbolic_link_to_somewhere |
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Find the most recently modified files in a directory and all subdirectories$ find /path/to/dir -type f -mtime -7 -print0 | xargs -0 ls -lt | head |
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List open files$ lsof -n |
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Set a colorful bash prompt per dev test prod environments$ PS1='\[\e[1;31m\][\u@\h \W]\$\[\e[0m\] ' |
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Print the lines of file2 that are missing in file1$ grep -vxFf file1 file2 |
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Find in files, recursively$ find /etc -type f -print0 2>/dev/null | xargs -0 grep --color=AUTO -Hn 'nameserver' 2>/dev/null |
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Concatenate PDF files using GhostScript$ gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=output.pdf -dBATCH file1.pdf file2.pdf file3.pdf |
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Format text with long lines to text with fixed width$ fmt -s -w80 file.txt |
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Come back quickly to the current directory after doing some temporary work somewhere else$ pushd /some/where/else; work; cd /somewhere; work; cd /another/place; popd |
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Export a git project to a directory$ git archive master | tar x -C /path/to/dir/to/export |
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Delete all tables of a mysql database$ mysql --defaults-file=my.cnf -e 'show tables' | while read t; do mysql --defaults-file=my.cnt -e 'drop table '$t; done |
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Run remote X11 applications with ssh$ ssh -X servername |
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Calculate the total disk space used by a list of files or directories$ du -s file1 dir1 | awk '{sum += $1} END {print sum}' |
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Check the performance of a script by re-running many times while measuring the running time$ for i in {1..10}; do time curl http://localhost:8000 >/dev/null; done 2>&1 | grep real |
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