10.3 Filename Modifiers (C Shell Only)

Filename modifiers cause the system to return portions of an absolute or relative filename, as defined in Table 10.3. OpenVMS users familiar with the F$PARSE lexical function, which calls the $PARSE RMS service for extracting portions of a file specification, can achieve similar results using a shell script with filename modifiers. UNIX has no direct way of modifying filenames on a remote UNIX computer. Compare the OpenVMS command F$PARSE(filespec "NODE"). However, as we shall see in Section 13.2.7, you can pipe a remote file lookup to a filename modifier to return portions of the filename, but not the remote host name. The following example illustrates the use of the filename modifiers outlined in Table 10.3.

$ <b class="bold">TYPE TEST.COM</b>$! Return portions of a filename$ INQUIRE FILENAME "Enter filename:$ WRITE SYS$OUTPUT - F$PARSE(FILENAME   "NAME")$ WRITE SYS$OUTPUT - F$PARSE(FILENAME   "TYPE")$ WRITE SYS$OUTPUT - F$PARSE(FILENAME   "DIRECTORY")$ A:=F$PARSE(FILENAME   "NAME")$ B:=F$PARSE(FILENAME   "TYPE")$ C = A + B

% <b class="bold">cat test_script</b># Return portions of a filename"echo -n "Enter filename:"set filename = $

<a name="435"></a><a name="IDX-237"></a>$ WRITE SYS$OUTPUT C$ EXIT$ @<b class="bold">TEST</b>Enter filename: <b class="bold">[FRED]PROGRAM.C</b>PROGRAMC[FRED]PROGRAM.C

#exit% <b class="bold">test_script</b>Enter filename: <b class="bold">/usr/fred/program.c</b>programc/usr/fredprogram.c