Bash Test Syntax Error
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of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How do I check syntax in bash without running the script? up vote 165 down vote bash syntax error invalid arithmetic operator favorite 52 Is it possible to check a bash script syntax without executing it? Using Perl, I can run perl -c 'script name'. Is there any equivalent command for bash scripts? linux bash unix syntax gnu share|improve this question edited May 3 '12 at 16:57 Rob Hruska 69.4k21134171 asked Oct 5 '08 at 12:51 Tom Feiner 6,176154049 Related: Is there a static analysis tool like Lint or Perl::Critic for bash syntax error near unexpected token then' shell scripts? –blong Jun 3 '14 at 20:47 add a comment| 6 Answers 6 active oldest votes up vote 249 down vote accepted bash -n scriptname Perhaps an obvious caveat: this validates syntax but won't check if your bash script tries to execute a command that isn't in your path, like ech hello instead of echo hello. share|improve this answer edited Nov 15 '12 at 15:47 Chris 19.2k57396 answered Oct 5 '08 at 12:55 andy 4,49011217 7 In bash's manpage, under "SHELL BUILTIN COMMANDS / set", -n is documented, and as the beginning of the manpage states, bash interprets all single-character options that set does. –ephemient Oct 5 '08 at 20:55 17 to add to the (for me) non obvious caveat, it also won't catch an error caused by a missing space if ["$var" == "string" ] instead of if [ "$var" == "string" ] –Brynjar Aug 5 '11 at 16:13 9 @Brynjar That's because it's just syntax checking. The open bracket isn't syntax, that's the name of the function to run. type [ says "[ is a shell builtin". It ultimately delegates to the test program, but it expects a closing bracket, as well. So it's like if test"$var", which isn't what the author meant, but is synta
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Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign http://stackoverflow.com/questions/171924/how-do-i-check-syntax-in-bash-without-running-the-script up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Know whether the shell script contains syntax error without running the script up vote 21 down vote favorite 7 I have a long shell script containing a lot of conditions and I want to know whether http://askubuntu.com/questions/482687/know-whether-the-shell-script-contains-syntax-error-without-running-the-script there is any syntax error in the script without running it. Since shell script is interpreted I think it is not possible but is there a way to know by using some trick. scripts share|improve this question asked Jun 13 '14 at 8:36 Ankit Zalani 22026 add a comment| 2 Answers 2 active oldest votes up vote 29 down vote accepted bash -n scriptname Although, this will check syntax, not command availability. (will not warn if script uses a command that is not installed yet) share|improve this answer edited Jun 13 '14 at 9:23 user.dz 23k950105 answered Jun 13 '14 at 8:49 Bodo 394612 3 In addition to bash's inbuilt syntax checḱing you can use shellcheck to identify less severe issues and bad practices. –Glutanimate Jun 15 '14 at 22:40 add a comment| up vote 3 down vote I found an online tool to check the syntax of the script. In addition to checking the script, also suggests possible corrections to avoid errors. Check shell script online share|improve this answer answered Jul 2 '14
commands:classictest Table of Contents The classic test command General syntax File tests String tests Arithmetic tests Misc syntax Number of Arguments Rules AND and OR The Prefered Way The other way: -a and -o Why you should avoid using -a http://wiki.bash-hackers.org/commands/classictest and -o Precedence and Parenthesis NOT Pitfalls summarized General Code examples Snipplets Listing directories See http://unix.stackexchange.com/questions/13790/debugging-shell-scripts-syntax-checking-without-executing also Discussion The classic test command test
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Debugging shell scripts: Syntax checking without executing up vote 7 down vote favorite Is there some option I can give to just check the syntax of a [bash] shell script to check the syntax of it, but not actually execute anything nor cause any potential damage? bash shell-script testing share|improve this question edited May 25 '11 at 20:40 asked May 25 '11 at 20:34 Aeyoun 483720 add a comment| 1 Answer 1 active oldest votes up vote 7 down vote accepted From the bash(1) man page: -n Read commands but do not execute them. This may be used to check a shell script for syntax errors. This is ignored by interactive shells. share|improve this answer answered May 25 '11 at 20:56 Michael Mrozek♦ 44.9k19144179 Obviously. I don’t know why I was so blind that I couldn’t see this when I was through the manual pages. –Aeyoun May 25 '11 at 21:34 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged bash shell-script testing or ask your own question. asked 5 years ago viewed 6405 times active 5 years ago Related 0Shell script executing in the terminal but not from shell script file14How to make bash abort the execution of a script on syntax error?2Bash shell scripting basic question regarding the syntax and basename0Shell script testing through terminal simulation3syntax error in conditional expression while executing the shell script?1Check that only root can edit a script before executing it9Check bash/shell script dependencies3Is it possible to e