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Top Forums Shell Programming and Scripting Bash - trap error file not found Post 302966037 by Don Cragun on Saturday 6th of February 2016 07:06:40 PM
Old 02-06-2016
This might be a little more than you want, but have you considered using set -e? The standards describe the behavior of the shell when the set -e option is in effect as:
Code:
When this option is on, when any command fails (for any of the reasons listed in Section
2.8.1 or by returning an exit status greater than zero), the shell immediately shall exit with
the following exceptions:
    1.  The failure of any individual command in a multi-command pipeline shall not cause
        the shell to exit.  Only the failure of the pipeline itself shall be considered.
    2.  The −e setting shall be ignored when executing the compound list following the
        while, until, if, or elif reserved word, a pipeline beginning with the ! reserved word,
        or any command of an AND-OR list other than the last.
    3.  If the exit status of a compound command other than a subshell command was the
        result of a failure while −e was being ignored, then −e shall not apply to this
        command.
This requirement applies to the shell environment and each subshell environment
separately.  For example, in:
        set -e; (false; echo one) | cat; echo two
the false command causes the subshell to exit without executing echo one; however, echo
two is executed because the exit status of the pipeline (false; echo one) | cat is
zero.

 

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exit(1) 							   User Commands							   exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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