Bash Checks

Bash Checks in Markdown Table

Check	Description	Returns True If	Example
`[ -z "$string" ]`	String is empty	The string has zero length	`[ -z "" ] && echo "Empty"`
`[ -n "$string" ]`	String is not empty	The string has non-zero length	`[ -n "Hello" ] && echo "Not Empty"`
`[ "$string1" = "$string2" ]`	Strings are equal	Both strings are identical	`[ "Hello" = "Hello" ] && echo "Equal"`
`[ "$string1" != "$string2" ]`	Strings are not equal	Both strings are different	`[ "Hello" != "World" ] && echo "Not Equal"`

Check	Description	Returns True If	Example
`[ "$num1" -eq "$num2" ]`	Numbers are equal	`$num1` is equal to `$num2`	`[ 5 -eq 5 ] && echo "Equal"`
`[ "$num1" -ne "$num2" ]`	Numbers are not equal	`$num1` is not equal to `$num2`	`[ 5 -ne 10 ] && echo "Not Equal"`
`[ "$num1" -gt "$num2" ]`	Number is greater than	`$num1` is greater than `$num2`	`[ 10 -gt 5 ] && echo "Greater"`
`[ "$num1" -lt "$num2" ]`	Number is less than	`$num1` is less than `$num2`	`[ 5 -lt 10 ] && echo "Less"`
`[ "$num1" -ge "$num2" ]`	Number is greater or equal	`$num1` is greater than or equal to `$num2`	`[ 10 -ge 10 ] && echo "Greater/Equal"`
`[ "$num1" -le "$num2" ]`	Number is less or equal	`$num1` is less than or equal to `$num2`	`[ 5 -le 10 ] && echo "Less/Equal"`

Check	Description	Returns True If	Example
`[ -e "$file" ]`	File exists	The file exists	`[ -e "file.txt" ] && echo "Exists"`
`[ -d "$file" ]`	File is a directory	The file is a directory	`[ -d "folder" ] && echo "Directory"`
`[ -r "$file" ]`	File is readable	The file is readable	`[ -r "file.txt" ] && echo "Readable"`
`[ -w "$file" ]`	File is writable	The file is writable	`[ -w "file.txt" ] && echo "Writable"`
`[ -x "$file" ]`	File is executable	The file is executable	`[ -x "script.sh" ] && echo "Executable"`
`[ -s "$file" ]`	File is not empty	The file is not empty	`[ -s "file.txt" ] && echo "Not Empty"`
`[ -L "$file" ]`	File is a symbolic link	The file is a symbolic link	`[ -L "link" ] && echo "Symbolic Link"`