- the directory /cad/cadence/IC615.06.15.502.lnx/tools/bin would be added to the local search path for programs ( not for libraries, only for programs ).
- The file techsweep.out in the current directory would be created if it does not exist, and emptied of all content if it already exists. The ! flag part of >! says that this is to be done even if the csh or tcsh "noclobber" protection is active, that would normally prevent existing files from being overwritten if just > were used. >! is "force" the file to be initialized as empty even if it already exists
- the program or script /cad/cadence/MMSIM13.ISR12.11.292.lnx86/tools/bin/spectre would be invoked
- the character vector techsweep.scs would be passed as the first parameter to the program
- any "standard" output that /cad/cadence/MMSIM13.ISR12.11.292.lnx86/tools/bin/spectre produces will be written to that file techsweep.out
- any "error" output that the program produces will be written to the terminal (or error stream of the invoking program, depending on exact configuration)
- typically the way that this small script would be invoked would be that a new process would have been created to run it. The change to the path would have been made within that new process, and the process would normally get deleted, so the context in which the path was changed would have gone away; there would be no permanent change to the path
- But even if this small script was invoked within a different csh / tcsh script, the details of how path was set are for local setting, and would not affect the calling script -- the form of set that was used is effectively only for local variables (that affect the current shell script and any programs and scripts called from the current shell script). If this had been implemented in ksh or a shell derived from ksh, the same bit about local variables would be true, but there would also be obscure circumstances under which the change could be inherited; I do not recall now whether that obscure inheritence possibility exists for csh / tcsh . (That obscure circumstances do not apply here... I am just indicating that the fact that the change to path would be local is not 100.000% of the time... just rare enough that you may never see the counter-example in your lifetime.
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- $path specifies a set of directories where executable programs are located.
- >! may indicated to overwrite an existing file named "techsweep.out" in the specified path.