era@NIWOT.UCAR.EDU (03/21/89)
Does anybody out there know what i/o redirection with the Bourne shell's read command is *supposed* to do? The following shell script reads the first word from itself into the variable x and echoes it under SunOS 4.0. However, it hangs under OSx4.4 and Ultrix 2.2; if you type a line at it while it's hung, it belches out "$0: illegal io". Anybody know who's "right"? -------- #!/bin/sh read x < $0 echo x = $x -------- Ed Arnold, NCAR era@ncar.ucar.edu
era@NIWOT.UCAR.EDU (03/21/89)
Oooops ... please disregard my previous msg on this subject. Sure nuff, it's one of those 4.x vs. S/V issues.
csg@pyramid.pyramid.com (Carl S. Gutekunst) (03/21/89)
In article <8903201700.AA00197@era.ucar.edu.UCAR.EDU> era@NIWOT.UCAR.EDU writes: >#!/bin/sh >read x < $0 >echo x = $x Redirection of the "read" command is not supported in the 4.3BSD Bourne shell; it is supported in the System V Bourne shell. So, this works on SunOS and the Pyramid's att universe, but does not on Ultrix or the Pyramid's ucb universe. You can do what you want -- better I think -- using head(1): #!/bin/sh x=`head -1 $0` echo x = $x <csg>