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Operating Systems Linux UNIX Utility Development Conventions? Post 303040894 by wisecracker on Friday 8th of November 2019 09:27:41 AM
Old 11-08-2019
Hi MonilGome...

I will add to vbe's post and say if you want any of your code, whether it be a shell script, a dedicated compiled executable or a separately interpreted script, to be portable then make sure it is POSIX compliant; also if it is a dedicated executable and you intend it to be used as along with other utilities make sure you include a piping facility.
For example: echo "3 + 7" | bc ...
Also 'zsh', along with 'ksh[93]', has floating point arithmetic; DO NOT take this for granted, POSIX compliant shells only have integer arithmetic ONLY - so beware.

As a hobbyist coder, this is just my 5 pennoth...

Bazza...
 

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sfind(1)                                                            ShapeTools                                                            sfind(1)

NAME
sfind - shapeTools RMS recursively descend a system hierarchy SYNOPSIS
sfind [-subs | -comp] directory [command] DESCRIPTION
Sfind recursively descends the system hierarchy of a software system managed by the shapeTools Release Management System (shapeTools RMS). Sfind starts it's search from directory downwards. According to the shapeTools RMS conventions, directory must contain a Shapefile which lists the subsystems in the variable SUBSYSTEMS and the subsystem components in the variable COMPONENTS. Each subsystem is visited. If no command is specified, sfind echoes the pathnames of the subsystems it finds, or, if the option -comp is given, the pathnames of the components of each subsystem. When a command is given, it is executed in the directory of each subsystem. The string ``{}'' in command is replaced by the pathname of the subsystem or component. OPTIONS
-subs command is invoked for each subsystem. This is the default. ``{}'' in command is replaced by the pathname of the subsystem. -comp command is invoked for each component. ``{}'' in command is replaced by the pathname of the component. EXAMPLES
List all system components: sfind -comp ~/development Show the pathnames of all versionfiles: sfind ~/development echo -n {}/ ; shape -echo VERSIONFILE Echo identification of the last release of each subsystem: sfind ~/development vl -last -format '$__lastrelease$\n' `shape -echo VERSIONFILE` Necessary quoting to echo a pair of curly braces: sfind ~/development echo two \{\} braces SEE ALSO
find(1), sh(1), shape(1), shape_RMS(1), shape_tmpl(7) CAVEATS
Quoting of shell meta characters can be tough. BUGS
The program is slow because shape(1) is called at least once for each subsystem. When sfind is interrupted, usually shape(1) displays the message ``shape - interrupted'', which may be confusing. AUTHOR
Andreas.Lampen@cs.tu-berlin.de shape_RMS-1.15 Fri Jun 25 17:01:50 1993 sfind(1)
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