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Top Forums UNIX for Beginners Questions & Answers Automate "touch" bash script not working. Post 302998419 by apmcd47 on Thursday 1st of June 2017 06:06:14 AM
Old 06-01-2017
Dear iamwrong,
I hope we haven't driven you to another forum already. After considering you script I've come up with this albeit over-engineered script which may have the behaviour I think you wanted. I have included comments to explain why I ave done the things I have.
Code:
#!/bin/bash         
                    # no need for the -i option
                    # IFS statements removed as you don't actually need them

usage() {           # Few do it but you really should have a usage
                    # function even on a script this short
   printf "Usage: %s file\n" ${0##*/}
   printf "Where file is the file to be timestamped.\n"
   printf "Remember to quote the filename if there are spaces in it.\n"
   printf "Example: %s %s\n" ${0##*/} $'"my holiday snap.jpg"'
   printf "Required environment variable: TDATE\n"
   printf "Please ensure it is exported with %s\n" $'\e[7msuperdate\e[0m'
}

if [ -z "${TDATE}" ]    # Do this test first
then                    # exit if it fails
   printf "\nTDATE not set\n\n"
   usage
   exit 1
fi

ref_file=/tmp/${0##*/}$$        # set up your reference file
trap 'rm -f "${ref_file}"' 0    # remove the reference file on exit
                                # The -f silences rm if file hasn't been created
                                # when we exit
trap 'exit' HUP INT QUIT ABRT TERM  # clean exit on any of these interrupts
                                    # Probably not useful in this short script

touch -t "${TDATE}" "${ref_file}"

picc="${1}"
if [ -z "${picc}" ] || [ ! -f "${picc}" ]
then    # can't find $picc
   printf "\nCannot find file to update!\n\n"
   usage
   exit 1
fi

touch -r "${ref_file}" "${picc}"       # business of this script 

# exit trap clears the reference file

I am guessing that the reason you used
Code:
picc=$*

in your original code was to allow for spaces in your file names. If so this script is more likely to work the way you wanted it to.

I hope you find this useful. As I said it is somewhat over-engineered, what with using a reference file for the touch command and the resultant interrupt handling, as well as the usage function.

Andrew
 

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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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