bashoneliners.com

Welcome to bashoneliners.com, a curated collection of practical and well-explained Bash one-liners, snippets, tips and tricks. We aim to make each published one-liner to be of high quality: useful, easy to read, follows best practices, with clear, detailed, accurate explanation. These one-liners should help you automate tasks, troubleshoot problems, whether it be in system administration, file management, networking or programming.

Re-compress a gzip (.gz) file to a bzip2 (.bz2) file

time gzip -cd file1.tar.gz 2>~/logfile.txt | pv -t -r -b -W -i 5 -B 8M | bzip2 > file1.tar.bz2 2>>~/logfile .txt

February 1, 2012DAVEB

Test your hard drive speed

time (dd if=/dev/zero of=zerofile bs=1M count=500;sync);rm zerofile

February 1, 2012DAVEB

Calculate the average execution time (of short running scripts) with awk

for i in {1..10}; do time some_script.sh; done 2>&1 | grep ^real | sed -e s/.*m// | awk '{sum += $1} END {print sum / NR}'

December 21, 2011bashoneliners

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

December 17, 2011bashoneliners

Redirect the output of the time builtin command

{ time command; } > out.out 2> time+err.out

November 20, 2011bashoneliners