if
Performs conditional processing in shell scripts. See also: test, [. More information: <https://www.gnu.org/software/bash/manual/bash.html#Conditional-Constructs>.
Install
- All systems
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curl cmd.cat/if.sh
- Debian
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apt-get install execline - Ubuntu
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apt-get install execline -
Alpine
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apk add execline - Kali Linux
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apt-get install execline - Windows (WSL2)
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sudo apt-get updatesudo apt-get install execline - Dockerfile
- dockerfile.run/if
- Docker
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docker run cmd.cat/if ifpowered by Commando
Performs conditional processing in shell scripts. See also: test, [. More information: <https://www.gnu.org/software/bash/manual/bash.html#Conditional-Constructs>.
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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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