Another case of Badly placed parens. Post: 302720681

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Top Forums Shell Programming and Scripting Another case of Badly placed parens. Post 302720681 by DGPickett on Wednesday 24th of October 2012 01:37:18 PM

10-24-2012

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I find a vi search for [('"] allows me to verify the closing parens with % and count the quotes in and out. Figureing if the ) is in a different quoting space can be a problem. Good structural indentation helps identify quoted areas. Note that case statements can have wild card starting with ( so they do not confuse %, although case traditionally did not use them. If you have isolated () in character or string contexts, you can temporarily replace them with substitute strings like '~oparens' and '~cparens'. (The ~ is the rarest ascii visible glyph.)

You cannot blame tcsh or bash for the fact that exec() obeys the magic line. It is nice that you can ensure your scripts use the designed interpreter. If you source a file or feed the file to stdin, the magic is ignored (no exec()). You are even allowed one argument on the magic line, so you can say things like "#!/bin/awk -f" or "#!/bin/sed -f" and make scripts for tools not normally considered script interpreters. It saves a fork() and exec() over a shell script calling awk or sed.

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shtool-path

SHTOOL-PATH.TMP(1)					      GNU Portable Shell Tool						SHTOOL-PATH.TMP(1)

NAME

       shtool-path - GNU shtool command dealing with shell path variables

SYNOPSIS

       shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...]

DESCRIPTION

       This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments.  It
       prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found.

OPTIONS

       The following command line options are available.

       -s, --suppress
	   Supress output. Useful to only test whether a program exists with the help of the return code.

       -r, --reverse
	   Transform a forward path to a subdirectory into a reverse path.

       -d, --dirname
	   Output the directory name of str.

       -b, --basename
	   Output the base name of str.

       -m, --magic
	   Enable advanced magic search for ""perl"" and ""cpp"".

       -p, --path path
	   Search in path. Default is to search in $PATH.

EXAMPLE

	#   shell script
	awk=`shtool path -p "${PATH}:." gawk nawk awk`
	perl=`shtool path -m perl`
	cpp=`shtool path -m cpp`
	revpath=`shtool path -r path/to/subdir`

HISTORY

       The GNU shtool path command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken
       over into GNU shtool.

SEE ALSO

       shtool(1), which(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-PATH.TMP(1)