Compound ‘if’ statements with multiple expressions in Bash

by

For Bash, you can use the [[ ]] form rather than [ ], which allows && and || internally:

if [[ foo || bar || baz ]] ; then
  ...
fi

Otherwise, you can use the usual Boolean logic operators externally:

[ foo ] || [ bar ] || [ baz ]

…or use operators specific to the test command (though modern versions of the POSIX specification describe this XSI extension as deprecated — see the APPLICATION USAGE section):

[ foo -o bar -o baz ]

…which is a differently written form of the following, which is similarly deprecated:

test foo -o bar -o baz

More Related Contents:

  1. Why should there be spaces around ‘[‘ and ‘]’ in Bash?
  2. Are double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
  3. Test for non-zero length string in Bash: [ -n “$var” ] or [ “$var” ]
  4. Using the && operator in an if statement
  5. Difference between single and double quotes in Bash
  6. Command not found error in Bash variable assignment
  7. Why does shell ignore quoting characters in arguments passed to it through variables? [duplicate]
  8. How to use double or single brackets, parentheses, curly braces
  9. How do I compare two string variables in an ‘if’ statement in Bash? [duplicate]
  10. Brace expansion with variable? [duplicate]
  11. Usage of :- (colon dash) in bash
  12. Getting “command not found” error while comparing two strings in Bash
  13. Why equal to operator does not work if it is surrounded by space?
  14. What is the purpose of “&&” in a shell command?
  15. Is there a list of ‘if’ switches anywhere?
  16. Meaning of “[: too many arguments” error from if [] (square brackets)
  17. Difference between single and double square brackets in Bash
  18. How to check the exit status using an ‘if’ statement
  19. Floating point comparison with variable in bash [duplicate]
  20. Why source command doesn’t work with process substitution in bash 3.2?
  21. bash: $[] vs. $(())
  22. Bash if statement with multiple conditions throws an error
  23. Commenting in a Bash script inside a multiline command
  24. if, elif, else statement issues in Bash
  25. What does “plus colon” (“+:”) mean in shell script expressions?
  26. Validate date format in a shell script
  27. What does the curly-brace syntax ${var%.*} mean?
  28. Rsync syntax error when run from bash script
  29. Groups of compound conditions in Bash test [duplicate]
  30. What is the proper way to test a Bash function’s return value?

Leave a Comment