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Quick and dirty one-liner to get the average ping(1) time from a server.
when we work with terminal often we open man pages for help if we did some mistakes
and when we want to open the man page for command we are working with this one helps
as many people may be knowing that '!!' performs the last command action
we use it in sudo !! to perform the last action with root previleages
man !! will also be helpful and handy
Get the first IPv4 address of an interface
If you want to copy all files listed (with full path) in a text-file (i.e. cmus playlist.pl) to a certain directory use this nice oneliner...
Credits goes to RiffRaff: http://www.programmingforums.org/post242527-2.html
alternative to tr char '\012'
works with sed's that don't accept "\n"
allows for multi-char sentinals, while tr(1) only operates on single chars
i686 = 32 bits
x86_64 = 64 bits
the command "getconf LONG_BIT" will work just as well.
cat - concatenate MP3 files and save it...
Useful command to avoid unreadble script in a single file...
You can use this in shell scripts to show which commands are actually run. Just prepend every "critical line" with "v˽".
echo "Let me create a directory for you"
v mkdir $TMP/new
In scripts this can be more useful than "set -x", because that can be very verbose with variable assignments etc.
Another nice use is if you prepend every "critical" command with "v", then you can test your script by commenting out the actual execution.
Build an awk array with all commands and then select a random one at the end.
This avoids spawning extra processes for counting with wc or generating random numbers.
Explicitly call /bin/ls to avoid interactions with aliases.
Useful in while and if statements
if not grep string filename; then echo string not found; exit 1; fi
This command is useful for separating a text file where all the words are in one line. Any group of spaces will be replaced with a single newline. Instead of one long line of tokens. You'll have a long list of tokens. One token per line.
This can be used in scripts, to find out the origin of target IP etc.
This will show a random cow with cowsay.