if/Test Statement
test -e file
[ -e file ]
[[ -e file ]]
x=2
test $x -eq 1
[ $x -eq 2 ]
[[ $x -eq 3 ]]
File Test Operators
File status can be examined using several operators.
Parameter: Meaning
-s file size greater than zero
-r file exists and is readable
-w file exists and is writable
-x file exists and is executable
-u file exists and has the SUID bit set
-g file exists and has the SGID bit set
-k file exists and has the SVTX sticky bit set
-e file exists
-f file exists and is an ordinary file
-d file exists and is a directory
-c file exists as a character special file
-b file exists and is a named pipe file
-p file exists and is a named pipe file
-L file ...