Commands by salazar (1)

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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Top Command in batch mode
running top command in batch mode. it is usefull if you want to redirect the output in a file.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Export MySQL query as .csv file
This command converts a MySQL query directly into a .csv (Comma Seperated Value)-file.

Tweet from Terminal to twitter !
Tweeting from terminal to twitter accounts..

pimp text output e.g. "Linux rocks!" to look nice

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

In place line numbering
Add permanent line numbers to a file without creating a temp file. The rm command deletes file10 while the nl command works on the open file descriptor of file10 which it outputs into a new file again named file10. The new file10 will now be numbered in the same directory with the same file name and content as before, but it will in fact be a new file, using (ls -i) to show its inode number will prove this.

Check a server is up. If it isn't mail me.
For some reason the 2&>1 does not work for me, but the shorter stdout/stderr redirection >& works perfectly (Ubuntu 10.04).

git pull all repos

Find the package that installed a command


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