-c will count the number of times your search matches in the file.

If a session with named the same as your username already exists, then attach to it, otherwise create it

when bad day comes...

Syntax:

$ prepend content to add [filename]

Uses ed, so no temp files created.

For example we need find fast where located and described keyword COMMIT_EDITMSG in man files. Here example howto solve it by search with command bzgrep in man files. Generally these files in bz compressed format. You can use another keywords to your search. Common syntax is:

bzgrep -lE keyword1 /usr/share/man/man?/optional-keyword-to-refine*

or

bzgrep -lE keyword1 /usr/share/man/man?/*

where optional-keyword-to-refine is optional and may be omitted but used to speedup search

Of course you may combine other options for bzgrep (its based on grep)

The equivalent of opening each file in vim and doing

gg=G:wq . Bufdo makes it faster by obviating the need to start vim for each file separately.

Creates an incremental snapshot of individual folders.

Problem: I wanted to backup user data individually, using and incremental method. In this example, all user data is located in "/mnt/storage/profiles", and about 25 folders inside, each with a username ( /mnt/storage/profiles/mike; /mnt/storage/profiles/lucy ...)

I need each individual folder backed up, not the whole "/mnt/storage/profiles". So, using find while excluding directories depth and creating two variables (tarfile=username & desdir=destination), tar will create a .tgz file for each folder, resulting in a "mike_2013-12-05.tgz" and "lucy_2013-12-05.tgz".

Problem: I wanted to backup user data individually. In this example, all user data is located in "/mnt/storage/profiles", and about 25 folders inside, each with a username ( /mnt/storage/profiles/mike; /mnt/storage/profiles/lucy ...)

I need each individual folder backed up, not the whole "/mnt/storage/profiles". So, using find while excluding directories depth and creating two variables (tarfile=username & desdir=destination), tar will create a .tgz file for each folder, resulting in a "mike_full.tgz" and "lucy_full.tgz".

Doesn't require finger and should work whatever the underlying auth mechanism is

These series of commands allows you all at once to make a backup of your current config, edit that config, then saves it as the running config and makes it persistent. I would advise knowing what your doing to the config before running this because if you mess up say the port 22 portion, you may get knocked off the system. ;) Don't say I didn't warn ya!

I use it to verify if readline support was specified at compile time.

This bash one-liner will let you watch the tail end of a log file in real time.

also shows the ethernet adapter

May be useful to get user's ip address over the phone, as users struggle to read through a long ipconfig result.

http://stackoverflow.com/questions/1628204/how-to-run-a-command-in-background-using-ssh-and-detach-the-session

If you want to test output, run it like this:

for fn in *.epub; do echo mv \"$fn\" \"`echo "$fn" | sed -E 's/\.*\/*(.*)( - )(.*)(\.[^\.]+)$/\3\2\1\4/' | sed -E 's/(.*) ([^ ]+)( - )(.*)/\2, \1\3\4/' `\";done > rename.txt