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> Performs conditional processing in shell scripts.
> See also: `test`, `[`.
Execute the specified commands if the condition command's exit status is zero:
if {condition_command}; then {echo "Condition is true"}; fi
Execute the specified commands if the condition command's exit status is not zero:
if ! {condition_command}; then {echo "Condition is true"}; fi
Execute the first specified commands if the condition command's exit status is zero otherwise execute the second specified commands:
if {condition_command}; then {echo "Condition is true"}; else {echo "Condition is false"}; fi
Check whether a [f]ile exists:
if [[ -f {path/to/file} ]]; then {echo "Condition is true"}; fi
Check whether a [d]irectory exists:
if [[ -d {path/to/directory} ]]; then {echo "Condition is true"}; fi
Check whether a file or directory [e]xists:
if [[ -e {path/to/file_or_directory} ]]; then {echo "Condition is true"}; fi
Check whether a variable is defined:
if [[ -n "${variable}" ]]; then {echo "Condition is true"}; fi
List all possible conditions (`test` is an alias to `[`; both are commonly used with `if`):
man [
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