Commands tagged bash (821)

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Find out when your billion-second anniversary is (was).
This is the same command as this one, but for OS X. http://www.commandlinefu.com/commands/view/3053/find-out-when-your-billion-second-anniversary-is-was.

See multiple progress bars at once for multiple pipes with pv
In this example we convert a .tar.bz2 file to a .tar.gz file. If you don't have Pipe Viewer, you'll have to download it via apt-get install pv, etc.

Batch Convert SVG to PNG (in parallel)
Use GNU Parallel: short, easy to read, and will run one job per core.

Synchronize date and time with a server over ssh
Set Remote Server Date using Local Server Time (push)

resize all JPG images in folder and create new images (w/o overwriting)
Convert all jpegs in the current directory into ~1024*768 pixels and ~ 150 KBytes jpegs

Determining the excat memory usages by certain PID
this command gives you the total number of memory usuage and open files by the perticuler PID.

Generate trigonometric/log data easily

Revert back all files currently checked out by Perforce SCM for edit

Create backup copy of file, adding suffix of the date of the file modification (NOT today's date)
When I go to change a configuration file I always like to make a backup first. You can use "cp -p" to preserve the modification time, but it gets confusing to have file.prev, file.prev2, etc. So I like to add a YYMMDD suffix that shows when the file was last changed. "stat -c %Y" gives you the modification time in epoch seconds, then "date -d @" converts that to whatever format you specify in your "+format" string.

Downsample mp3s to 128K
This will lower the quality of mp3 files, but is necessary to play them on some mobile devices.


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