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bash exit with error

If the download succeeds, the exit code of the loop is the exit code of the echo command. It only takes a minute to sign up. If N is not given, the exit status code is that of the last executed command.. A plain exit command would exit with the exit status of the last executed command which would be false (code=1) if the download fails. A status of zero indicates success, while any other status (1 to 255) indicates a failure. Hence we can use the particular bash variable $? Letting curl echo the contents of the file and piping it to bash accounts for the text output of the curl command and allows bash to execute it. The most common use of the trap command though is to trap the bash-generated psuedo-signal named EXIT. I'll bet that, if you try this, you will get the same results: $( cat /[path]/ ); echo $? Every time command terminated shell gets an exit code indicating success or failure of the command. Yet, you might never know about the code, because an exit code doesn't reveal itself unless someone asks it to do so. Say, for example, that you have a script that creates a temporary file. An exit code is a system response that reports success, an error, or another condition that provides a clue about what caused an unexpected result from your command or script. For more info see bash man page online or read it at the cli by using the man command: man bash Exit status is not limited to shell script. Replace: done with: done || exit 1 This will cause the code to exit if the for loop exits with a non-zero exit code.. As a point of trivia, the 1 in exit 1 is not needed. If you want your script to exit when that test returns true (the previous command failed) then you put exit 1 (or whatever) inside that if block after the echo. #!/bin/bash ## minefield ## version 0.0.1 - initial ##### minefield { a00075e82f2d59f3bd2b4de3d43c6206e50b93bd2b29f86ee0dfcb0012b6 Rather than deleting it at each place where you exit your script, you just put a trap command at the start of your script that deletes the file on exit: The difference "between the return and exit statement in BASH functions with respect to exit codes" is very little. Examples #. to get the exit status of the command. Every command that runs has an exit status. The Linux Documentation Project has a pretty good table of reserved exit codes and what they are used for. When used in shell scripts, the value supplied as an argument to the exit command is returned to the shell as an exit code.. That check is looking at the exit status of the command that finished most recently before that line runs. An exit value greater than 255 returns an exit code modulo 256.For example, exit 3809 gives an exit code of 225 (3809 % 256 = 225). Never tried that, not sure bash works that way. The exit command in bash accepts integers from 0 - 255, in most cases 0 and 1 will suffice however there are other reserved exit codes that can be used for more specific errors. For instance: Both return a status, not values per se. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. [1] Out of range exit values can result in unexpected exit codes. Exit status at the CLI. Exit code 0 Success Exit code 1 General errors, Miscellaneous errors, such as "divide by zero" and other impermissible operations Exit code 2 Misuse of shell builtins (according to Bash documentation) Example: empty_function() {} Caveat: Using the proper exit code is not a …

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