getops : condition to restrict input options

drywall_dan

I have a shell script which accepts 4 input options (x:m:b:v). But i want to restrict my input option like. Condition 1 1. Accept option x or x and b eg: sh script -x <arg> (or) ;will execute function a defined in script sh script -x <arg> -b ;will execute the functions a and b Condition 2 2. Accept option m or m and b eg: sh script -m <arg> (or) ;execute function c sh script -m <arg1> -b ;should execute function for c and b Condition 3 3....

Originally asked by upkar on Stack Exchange (unix) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

As an example to illustrate my comment above, here is an excerpt from FreeBSD's /usr/src/bin/cp/cp.c : while ((ch = getopt(argc, argv, "HLPRafilnprsvx")) != -1) switch (ch) { case 'H': Hflag = 1; Lflag = 0; break; case 'L': Lflag = 1; Hflag = 0; break; ... case 'l': lflag = 1; break; ... case 's': sflag = 1; break; case 'v': vflag = 1; break; case 'x': fts_options |= FTS_XDEV; break; default: usage(); break; } Notice that the above sets a lot of boolean variables like Hflag, Lflag, lflag, sflag, etc. This not only allows the code to test boolean relationships between flags, but it also allows the presence of one flag to activate another, or to override another. Also notice that the default...

Full answer by Jim L.: https://unix.stackexchange.com/a/521825 (CC BY-SA 4.0).

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