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Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

replace a character/word/string in a file using vim
Replace all ocurrences in the file. The g option is to replace more than one occurrence in the same line. Whitout the g option, it only replace the first occurrence in the line.

Use tee to process a pipe with two or more processes
Tee can be used to split a pipe into multiple streams for one or more process to work it. You can add more " >()" for even more fun.

MySQL dump restore with progress bar and ETA
Display a progress bar while restoring a MySQL dump.

Check if your webserver supports gzip compression with curl

SAR - List the average memory usage for all days recorded under '/var/log/sa/*' using sar -r.

Easily search running processes (alias).

GRUB2: set Super Mario as startup tune

Batch rename extension of all files in a folder, in the example from .txt to .md

Copy a file over SSH without SCP


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