== Unix Cheat Sheet ==

To log in to the grid, you need to use PuTTY if you use a PC, or, in the case of a mac, you can log in from the terminal. 

=== How do I abort that command??? ===
Most commands can be aborted by pressing `ctr-C`. If it looks like you are in a text editor, but can't get out, try the following:
 * `ctr-X` 
 * Hit `Esc` several times, and then type `:q!`and press enter.


=== Loggin in to other machines with SSH ===

The `ssh`  command can be used to log in to other machines, or from a mac to the grid:

{{{
$ ssh usernam@host
}}}

=== List files ===

To list the files in the current directory:

{{{
$ ls
}}}

To get more information about every file, do

{{{
$ ls -l 
}}}

To get information about a specific file or directory (you could add -l too)

{{{
$ ls filename
}}}

=== Change working directory ===

{{{
$ cd path
}}}
where path is the directory you want to change to, eg
{{{
$ cd /proj/my-project
}}}

To print the current working directory use `pwd`.

There are two "special directories": `.` and `..`. The first corresponds to the current directory, the second corresponds to the directory above the current directory.

Finally, 
{{{
$ cd
}}}
without any arguments will return you to your home directory.

=== Copy file ===

To copy a file use
{{{
$ cp source destination
}}}

You can have more than one source, but then the destination must be a directory. The final argument is always the destination. Eg.
{{{
$ cp file1 file2 file3 dest_dir
}}}

If any of the sourcres is a directory, you have to give copy the `-r` option.
{{{
$ cp -r dir1 dest_dir
}}}

=== Removing files or directories ===
{{{ 
$ rm file
}}}
will remove file,

If you would like to remove a directory, add the -r option to rm
{{{
$ rm -r directory
}}}

=== Create directory ===

{{{
$ mkdir directory_name
}}}

=== Looking at the content of a file
{{{
$ less filename
}}}
will bring up the content of the file on the screen. Use arrow keys to move up and down. You can search within the file by typing `/`and then what you would like to search for. Leave less by typing `q`.


=== Getting help on command usage ===
There is a man page available for most commands. It is accessed with the man command
{{{
$ man cp
}}}
for example. You can browse with arrow keys, and leave the man page by pressing `q`