1. echo $((2>3)) //expressions
2. test 2 > 3 && echo “Yes” //condition check
3. read -p “Prompt” $variable1 $variable2 //reading from console
4. echo “today is $(date)”
5. var=10 //declaring variable, no space before or after =
6. declare -r y=10 //creating constant or read only variable
7. unset var //frees the variable
8. declare -i y=10 //creating int variable
9. find $HOME -name *.c //finding all c files inside home
10. printf “%s\n” “$varName” //prints
11. sleep 3 //sleeps for 3 sec
12. if condition //if condition
then
command1
command2
..
commandN
fi
13. if condition //if-else condition
then
command1
else
command2
fi
14.
if condition //if-else-if condition
then command1
elif condition2
command2
elif condition3
command3
else
fi
15. Logical AND, && // Run second command only if first is successful.
16. Logical OR, || // Run second command only if first is successful.
17. grep text file.ext //search text inside a file
18. [ condition ] //condition checking similar to test
19. case $variable-name in
pattern1)
command1
commandN
;;
pattern2)
command1
…
;;
esac
20.
for var in item1 item2 … itemN
do
command1
command2
commandN
done
2. //declaring function
die()
{
echo “An error occurred.”
}
>die //call it
Reference : http://bash.cyberciti.biz/guide/Shebang *click the right top arrows to move forward pages
