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This command starts up the time synchronization service.
show directory three
don't `man bash`
This is useful for command line 'recycle bins' and such like
This command generates a sequential login list. Good to be used as a source of new logins.
for passwordless login
Force empties the user trash
Using the "#" in shell is surprisingly useful.
Some of the uses I found:
a) As a visible copy buffer in shell history (caveat: do not use for passwords :-)
b) To build complex commands until ready then hit the HOME, DEL, ENTER keys to run it
c) Placing reference data into shell history (search for tags with CTRL-R TAGNAME)
d) Putting aside a "work in progress" command to focus on another task (HOME # ENTER)
Useful for removes a package and its depends, for example to remove the gnome desktop environment, also configuration files will be removed, you should be carefully and sure that you want to do this.
which <command> > /dev/null 2>&1 || echo Error!
For example, I write
which colordiff > /dev/null 2>&1 && alias diff=colordiff
in my `~/.bashrc`.
-p -> loop (same as -n in sed)
-i -> edit files
-e -> execute command
replace Old with New in all *.html files
Weather based on your location
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
Found this one little more for me. This one removes the perl dependency (from command 2535).
Source for command : http://www.earthinfo.org/linux-disk-usage-sorted-by-size-and-human-readable/
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