Read This! | Picolisp | Picolisp Machine | Pil Sources | Pil Tutorials | Linux | BASH | C-Programmming | Javascipt | Python | Scheme | Operating Systems | AssemblyLanguage | Computer Security | Firewalls | Exploitation | Social Engineering | Metasploit | Emacs | vim | Pharo Smalltalk | Databases | Networking | Machine Learning | Git | Machine Learning | Algorithms | Open Data Science | Vikid's Bash Cookbook |

Bash - if statements

if [ condition ]; then # you can use [[ ]] also
  your code
fi
if [[ "${UID}" -eq 0 ]]
then
  echo 'You are root'
else
  echo 'You are not root'
fi
#!/bin/bash

if [ $(whoami) = 'root' ]; then
	echo "You are root"
fi
In one line:
if [ $(whoami) = 'root' ]; then echo "root"; else echo "not root"; fi
#!/bin/bash

if [ $(whoami) = 'root' ]; then
	echo "You are root"
else
	echo "You are not root"
fi
#!/bin/bash

AGE=$1

if [ $AGE -lt 13 ]; then
	echo "You are a kid."
elif [ $AGE -lt 20 ]; then
	echo "You are a teenager."
elif [ $AGE -lt 65 ]; then
	echo "You are an adult."
else
	echo "You are an elder."
fi

#!/bin/bash
echo Script name: $0
echo $# arguments
if [$# -ne 1];
    then echo "illegal number of parameters"
fi
$a -lt $b	        $a < $b
$a -gt $b	        $a > $b
$a -le $b	        $a <= $b
$a -ge $b	        $a >= $b
$a -eq $b	        $a is equal to $b
$a -ne $b	        $a is not equal to $b
-e $FILE	        $FILE exists
-d $FILE	        $FILE exists and is a directory.
-f $FILE	        $FILE exists and is a regular file.
-L $FILE	        $FILE exists and is a soft link.
$STRING1 = $STRING2	$STRING1 is equal to $STRING2
$STRING1 != $STRING2	$STRING1 is not equal to $STRING2
-z $STRING1	        $STRING1 is empty

http://thevikidtruth.com/wiki/?bashif

22may23   admin