A
alias: If creating an alias is what you want, then this is it.
apropos: We’re not the only ones providing help. This command you to search through the Help manual pages.
apt-get: This one works on Debian and Ubuntu distros. It is used to install and search for software packages.
aptitude: See the similarity with the above command? This one does the same thing.
aspell: Got bad spellings? Use the spell checker.
awk:No, this command is not for awkward situations. It lets you find text and replace it. Also, you can sort, index and validate things in a database.
B
basename: Sometimes files and directories have suffixes to their names. This one strips them off it.
bash: GNU Bourne-Again Shell
bc: This command is an arbitrary precision calculator language
bg: bg could stand for background couldn’t it? Regardless, that’s what it does, sends to the background
break: Exit from a loop
builtin: Run a shell builtin
bzip2: When there’s ‘zip’ in the name, that’s what it does. It compresses or decompresses files that are named.
C
cal: Need a calendar? This command displays one.
case: In ‘case’ you want to perform a command conditionally. This is how to do it.
cat: In programming, ‘cat’ usually stands for concatenate. Here too, but this command displays the content of the files after concatenation.
cd: Change Directory
cfdisk: In Linux, this command is the partition table manipulator
chgrp: This is how you change the ownership of a group.
chmod:‘Ch’ is for change. This one changes the access permissions.
chown: This one sounds too much like clown! Anyway, it’s not funny though. It changes the owner and group of a file.
chroot: Using this you can run a command, but with a different root directory
chkconfig System services (runlevel)
cksum: It displays the CRC checksum ad byte counts.
clear: If you need to clear the terminal screen, use this command.
cmp: Compare two files
comm: Compare two sorted files line by line
command: Run a command - ignoring shell functions
continue: This is for resuming the next iteration of a particular loop.
cp: Make a copy of files to a different location.
cron: Daemon to execute scheduled commands
crontab: Scheduling is sometimes very important. This command does it, it schedules a command that will run at a specified time.
csplit: Split a file into context-determined pieces
cut: When you need to cut down a file into parts, this is the command to use.
D
date: Use this command to change the date and time.
dc: The command stands for Desk Calculator.
ddrescue: Like most other such commands, this is the disk recovery tool.
declare: This command is used to declare the variables and to give attributes.
df: When you want to know the free space on your disk, use this.
diff: This command prints the differences between two files.
diff3: This is the same command as the previous one, but for three files.
dig: Need to lookup the DNS? Use this.
dir: Use this command for listing directory contents briefly.
dircolors: This command is used for colour setup for the ‘ls’ command.
dirname: Use this command to change a full pathname into just a path.
dirs: This command shows you the list of directories that are remembered.
dmesg: Use this command when you want to print kernel and driver messages.
du: Use this command to get an estimation of the file space usage.
E
echo: This command is used for displaying message on the screen.
egrep: This searches for files that have lines matching an extended expression.
eject: Use this when you need to eject a removable media.
enable: Use this to disable or enable bulletin shell commands.
env: Environment variables
ethtool: Ethernet card settings
eval: This command is used when you need to evaluate a many commands.
exec: For executing a command.
exit: Exiting the shell.
expand: This command converts all the tabs to spaces.
export: This command sets an environment variable.
expr: Some evaluate commands, this evaluates expressions.
alias: If creating an alias is what you want, then this is it.
apropos: We’re not the only ones providing help. This command you to search through the Help manual pages.
apt-get: This one works on Debian and Ubuntu distros. It is used to install and search for software packages.
aptitude: See the similarity with the above command? This one does the same thing.
aspell: Got bad spellings? Use the spell checker.
awk:No, this command is not for awkward situations. It lets you find text and replace it. Also, you can sort, index and validate things in a database.
B
basename: Sometimes files and directories have suffixes to their names. This one strips them off it.
bash: GNU Bourne-Again Shell
bc: This command is an arbitrary precision calculator language
bg: bg could stand for background couldn’t it? Regardless, that’s what it does, sends to the background
break: Exit from a loop
builtin: Run a shell builtin
bzip2: When there’s ‘zip’ in the name, that’s what it does. It compresses or decompresses files that are named.
C
cal: Need a calendar? This command displays one.
case: In ‘case’ you want to perform a command conditionally. This is how to do it.
cat: In programming, ‘cat’ usually stands for concatenate. Here too, but this command displays the content of the files after concatenation.
cd: Change Directory
cfdisk: In Linux, this command is the partition table manipulator
chgrp: This is how you change the ownership of a group.
chmod:‘Ch’ is for change. This one changes the access permissions.
chown: This one sounds too much like clown! Anyway, it’s not funny though. It changes the owner and group of a file.
chroot: Using this you can run a command, but with a different root directory
chkconfig System services (runlevel)
cksum: It displays the CRC checksum ad byte counts.
clear: If you need to clear the terminal screen, use this command.
cmp: Compare two files
comm: Compare two sorted files line by line
command: Run a command - ignoring shell functions
continue: This is for resuming the next iteration of a particular loop.
cp: Make a copy of files to a different location.
cron: Daemon to execute scheduled commands
crontab: Scheduling is sometimes very important. This command does it, it schedules a command that will run at a specified time.
csplit: Split a file into context-determined pieces
cut: When you need to cut down a file into parts, this is the command to use.
D
date: Use this command to change the date and time.
dc: The command stands for Desk Calculator.
ddrescue: Like most other such commands, this is the disk recovery tool.
declare: This command is used to declare the variables and to give attributes.
df: When you want to know the free space on your disk, use this.
diff: This command prints the differences between two files.
diff3: This is the same command as the previous one, but for three files.
dig: Need to lookup the DNS? Use this.
dir: Use this command for listing directory contents briefly.
dircolors: This command is used for colour setup for the ‘ls’ command.
dirname: Use this command to change a full pathname into just a path.
dirs: This command shows you the list of directories that are remembered.
dmesg: Use this command when you want to print kernel and driver messages.
du: Use this command to get an estimation of the file space usage.
E
echo: This command is used for displaying message on the screen.
egrep: This searches for files that have lines matching an extended expression.
eject: Use this when you need to eject a removable media.
enable: Use this to disable or enable bulletin shell commands.
env: Environment variables
ethtool: Ethernet card settings
eval: This command is used when you need to evaluate a many commands.
exec: For executing a command.
exit: Exiting the shell.
expand: This command converts all the tabs to spaces.
export: This command sets an environment variable.
expr: Some evaluate commands, this evaluates expressions.
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