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show all established tcp connections on os x

find all files containing a pattern, open them using vi and place cursor to the first match, use 'n' and ':n' to navigate

Delete all empty lines from a file with vim
If you need to delete lines that may contain space characters (such as tabs or spaces) as well as empty ones, try: $:v/\S/d Just an alternative.

comment current line(put # at the beginning)

auto complete arguments
Use it for command like : mkdir, chown, ls, less...

Format ps command output
ps command gives the possibility to display information with custom formatting with the -o options followed by the format specifier list.

Quick key/value display within /proc or /sys
Within /proc and /sys there are a lot of subdirectories, which carry pseudofiles with only one value as content. Instead of cat-ing all single files (which takes quite a time) or do a "cat *" (which makes it hard to find the filename/content relation), just grep recursively for . or use "grep . /blabla/*" (star instead of -r flag). For better readability you might also want to pipe the output to "column -t -s : ".

Mount a windows partition in a dual boot linux installation with write permission...[Read and Write]
If you have the library installed ntfs-3g, you will be able to mount the windows partition and write on it....

Backup all MySQL Databases to individual files

pid of manually selecting window


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