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Top Forums Shell Programming and Scripting Issue with pwd for script run by double click on script (MacOS High SIerra) Post 303031994 by Don Cragun on Saturday 9th of March 2019 12:02:42 AM
Old 03-09-2019
It should be stable as long as you double-click on a link to invoke your script (as long as you don't change the way you create the link, change any configuration variables that control how links are set, or change the attributes of the link). It should also work if you double-click on the script's name in finder. And, it should also work if you invoke it by giving its name with any absolute or relative pathname to your shell to invoke it, e.g., $PWD/script_name or ./script_name.

If, however, you invoke the script by just using its name (without specifying the directory in which it is located), you could end up with $0 just being script_name if one of the directories included in your $PATH variable is .. If this happens, you can't cd to ${0%/*}. But the following is still likely to work in all cases I can think of with what you're doing:
Code:
#!/bin/bash
[ "$0" != "${0%/*}" ] && cd "${0%/*}"
... ... ...

It might also work with ${BASH_SOURCE[0]}, but that would depend on which version of bash is being used.
Good luck,
Don
This User Gave Thanks to Don Cragun For This Post:
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-k] [-q] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell. Options: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
June 6, 1993 BSD
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