Keywords

main page

- - Command history
  - Boolean tests
"
- - Quotes
""
- - Empty string
#
- - sh-bang
  - Comments in a Shell script
$
- - Setting and getting variables
  - Background process ID $!
$#
- - Command line $#, $*, $@
$$
- - Process ID
$()
- - Quotes
  - Command substitution
$*
- - Command line $#, $*, $@
$0
- - Information about the shell
  - Command line parameters
$1
- - Command line parameters
$?
$@
- - Command line $#, $*, $@
$BASH_VERSION
- - Information about the shell
$HOME
- - Information about the shell
$PPID
- - Process ID
$RANDOM
- - Generate random output
$SHELL
- - Information about the shell
$version
- - Information about the shell
&&
- - Boolean tests
>
- - Redirection
>>
- - Redirection
<
- - Redirection
'
- - Quotes
*
- - Meta-characters (Wildcards)
--help
- - Getting Help
-d
- - file tests
-e
- - file tests
  - file tests
-ef
- - File comparision tests
-f
- - file tests
-h
- - Getting Help
-n
- - echo
-nt
- - File comparision tests
-ot
- - File comparision tests
-v
- - Debugging
-x
- - Debugging
.
./
- - Execute shell file
.bash_logout
- - logout script
.bash_profile
- - Start up files (Login shells)
.bashrc
- - Start up file (Noninteractive shells too)
/dev/null
- - Redirect to /dev/null
/etc/group
- - /etc/group
/etc/hostname
- - hostname
/etc/passwd
- - /etc/passwd
  - Change shell - chsh
/etc/profile
- - /etc/profile
/etc/profile.d/
- - /etc/profile
/etc/shadow
- - /etc/shadow
/etc/shells
- - Change shell - chsh
/proc/meminfo
- - /proc/meminfo
/var/log
- - Logfiles in /var/log
2>
- - Redirection
2>&1
- - Redirection
;
- - Separating commands
?
- - Meta-characters (Wildcards)
[]
- - Meta-characters (Wildcards)
\
- - Quotes
`
- - Quotes
  - Backtick or back quote
ack-grep
- - Finding text in a file
AIX
- - Unix vs Linux?
alias
Apache
- - License - Free and Open Source
apropos
- - Apropos
apt-cache
- - apt-cache
apt-get
- - Instalation with apt-get
aptitude
- - aptitude
at
- - Schedule using at or batch
atq
- - Schedule using at or batch
atrm
- - Schedule using at or batch
bash
- - Shells
bc
- - bc - calculator
bg
- - Job control
break
- - break
BSD
- - License - Free and Open Source
bunzip2
- - Compression and archiving
bzip2
- - Compression and archiving
cal
- - cal - calendar
case
- - case
cat
- - Displaying file content
cd
- - Change Directory
CentOS
- - Vendors and Distributions
chgrp
- - Change group only using chgrp
chmod
- - chmod
chmod +x
- - Shell Script
chown
- - Change ownership with chown
chsh
- - Change shell - chsh
clear
- - Clear screen
continue
- - continue
cp
- - Copy files and directories
crontab
- - crontab
csh
- - Shells
Ctrl-C
- - Job control
Ctrl-D
- - exit and exit code
  - write
Ctrl-l
- - Clear screen
Ctrl-r
- - Command history
Ctrl-Z
- - Job control
curl
- - curl and wget to fetch web pages
cut
- - cut
date
- - date
Debian
- - Vendors and Distributions
df
- - Display free disk space using df
do
- - while-loop
done
- - while-loop
dpkg
- - dpkg
du
- - Display disk usage statistics
echo
egrep
- - Finding text in a file
elif
- - elif
else
- - if
emacs
- - Text editors
env
- - env
esac
- - case
exit
- - exit and exit code
  - Exit from a script
export
- - Exporting variables
  - PATH environment variable
expr
- - Shell arithmetic
Fedora
- - Vendors and Distributions
fg
- - Job control
file
- - Determining File types
find
- - Finding files (find)
for
- - for loop
free
- - free
FreeBSD
- - Unix vs Linux?
ftp
- - ftp - File Transfer Protocol
gcc
- - Compiling software: Perl
gedit
- - Text editors
Gentoo
- - Vendors and Distributions
GNU
- - GNU
GPL
- - License - Free and Open Source
grep
- - Finding text in a file
gunzip
- - Compression and archiving
gzip
- - Compression and archiving
head
- - Displaying file content
HISTFILE
- - Command history
history
- - Command history
hostname
HPUX
- - Unix vs Linux?
htop
- - System load: htop
id
- - id
if
- - if
ifconfig
- - ifconfig
iftop
- - iftop
Irix
- - Unix vs Linux?
jobs
- - Job control
kernel
- - What is Linux?
kill
- - Process control
killall
- - killall
ksh
- - Shells
last
- - last
less
- - Displaying file content
LGPL
- - License - Free and Open Source
ln
- - Hard links
ln -s
- - Symbolic links
locale
- - locale
ls
- - Directory listing - ls
ls -l
- - ls -l
lsof
- - List open files (lsof)
lsof -i N
- - Port used by (lsof - list open files)
make
- - Compiling software: Perl
man
- - Documentation: man
mkdir
- - Creating directory
more
- - Displaying file content
mount
- - mounting external disks
mv
- - Move files or directories
nano
- - Text editors
nc
- - Port used by example 2
NetBSD
- - Unix vs Linux?
netstat
- - Show ports used with netstat
  - Routing configuration
OpenBSD
- - Unix vs Linux?
OSX
- - Unix vs Linux?
passwd
PATH
- - PATH environment variable
perl
- - Process CSV file
  - Compiling software: Perl
pico
- - Text editors
ping
- - Ping
profile
- - Start up files (Login shells)
ps
- - ps
PS1
- - Setting the prompt
PS2
- - Secondary prompt
pstree
- - ps
pwd
- - Current Working directory
read
- - read
Red Hat
- - Vendors and Distributions
rm
- - Removing File or Directory
rmdir
- - Removing File or Directory
route
- - Routing configuration
rsync
- - rsync
scp
- - scp - Secure Copy
screen
- - Keep remote session using screen
sed
- - sed - the stream editor
service
- - Services
set
- - set
  - PATH environment variable
set -o
- - set -o
sh
- - Shells
sh-bang
- - Shell Script
shift
- - shift
Solaris
- - Unix vs Linux?
sort
- - sort
source
- - Execute shell file
  - . (dot command)
ssh
- - ssh - Secure Shell
ssh-keygen
- - Generate public key
sshd
- - Install ssh server
su
- - su
sudo
- - sudo
SuSe
- - Vendors and Distributions
tail
- - Displaying file content
tar
- - Compression and archiving
tcsh
- - Shells
tee
- - tee
telnet
- - Telnet
time
- - time commands
tmux
- - Keep remote session using tmux
top
- - System load: top
touch
- - Create a file using 'touch'
tr
- - tr - transcribe
tracepath
- - Traceroute
traceroute
- - Traceroute
tree
- - Show directory tree
type
- - type
Ubuntu
- - Vendors and Distributions
umask
- - Default file permissions: umask
umount
- - mounting external disks
unalias
- - Creating alias in bash
uname
- - uname
uniq
- - uniq
unset
- - unset
unzip
- - Compression and archiving
uptime
- - uptime
vim
- - Text editors
vmstat
- - vmstat
w
- - w
wget
- - curl and wget to fetch web pages
whatis
- - whatis and man sections
whereis
- - whereis
which
- - which
  - PATH environment variable
while
- - while-loop
who
- - who
whoami
- - whoami
write
- - write
xz
- - Compression and archiving
yes
- - yes
yum
- - yum on CentOS 7.2 x64
zcat
- - Compression and archiving
zgrep
- - Compression and archiving
zip
- - Compression and archiving
zsh
- - Shells
{}
- - Meta-characters (Wildcards)
|
- - Pipes
||
- - Boolean tests
~/.profile
- - /etc/profile