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The Command Line Crash Course
http://cli.learncodethehardway.org/
29
Computer Science
Professional
09/19/2013
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Term
pwd
 Definition
print working directory
Term
hostname
 Definition
my computer's network name
Term
mkdir
 Definition
make directory
Term
cd
 Definition
change directory
Term
ls
 Definition
list directory
Term
rmdir
 Definition
remove directory
Term
pushd
 Definition
push directory
Term
popd
 Definition
pop directory
Term
cp
 Definition
copy a file or directory
Term
mv
 Definition
move a file or directory
Term
less
 Definition
page through a file
Term
cat
 Definition
print the whole file
Term
xargs
 Definition
execute arguments
Term
find
 Definition
find files
Term
grep
 Definition
find things inside files
Term
man
 Definition
read a manual page
Term
apropos
 Definition
find what man page is appropriate
Term
env
 Definition
look at your environment
Term
echo
 Definition
print some arguments
Term
export
 Definition
export/set a new environment variable
Term
exit
 Definition
exit the shell
Term
sudo
 Definition
DANGER! become super user root DANGER!
Term
chmod
 Definition
change permission modifiers
Term
chown
 Definition
change ownership
Term
$|$
 Definition
The | takes the output from the command on the left, and "pipes" it to the command on the right.

$ cat ex12.txt ex13.txt | less
Term
$<$
 Definition
The < will take and send the input from the file on the right to the program on the left.

$ cat < ex13.txt
$ less < ex12.txt
$ less < ex12.txt | cat | less
less < ex12.txt
Term
$>$
 Definition
The > takes the output of the command on the left, then writes it to the file on the right.

$ cat ex13.txt > ex15.txt
Term
$>>$
 Definition
The >> takes the output of the command on the left, then appends it

to the file on the right.
Term
*
 Definition
matches anything in a wildcard

$ ls *.txt
$ ls ex*.*
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