I have written following code to do: ls -l | wc -w, it works:
but when there are not only a single "|", if there are more such as:
ls -l | sort -r | sort | sort -r, This program does not work, i want to know how could i deal with it when there are more "|", another situation is that, if it mixes... (2 Replies)
I'm trying to learn how to get my script to execute the enter button when it telnets into a router and the router displays output but you need to press the space bar or enter button to continue displaying my output of the router.
How is this done? (0 Replies)
hi there, could use some basic PATH advice, i think, or something
find sometimes work, but which hasn't ever seemed to. for years!
what am i doing wrong that the commands which and find rarely work?
they used to work on the workstations i used ages ago...
running 10.5.8 because i... (4 Replies)
This is the script:
#!/bin/sh
if ; then rm -rf /usr/share/WallpaperChanger; fi
if ; then rm -rf /usr/bin/wallch; fi;
if ; then rm -rf /usr/share/applications/wallch.desktop; fi
if ; then rm -rf /usr/share/doc/wallch; fi
if ; then rm -rf /usr/share/man/man1/wallch.1.gz; fi
echo "Delete... (4 Replies)
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
the below code will search attr string inside makefile under the modelno on given path.
echo "Enter model no for searching string inside makefile"
read inputs2
#find /pools/home_unix/sapte/work/models/model/$inputs2 -name "makefile" | xargs grep "attr" \;
#;;I am getting below error.... (7 Replies)
Hello. I recently downloaded, configured and executed make on libjpeg.
Until there all worked well. Then suddenly when executing what shall be the simplest part, it returned this error message:
I have no idea as to why this problem is happening, since cjpeg was successfully built.
This is... (4 Replies)
Discussion started by: colt
4 Replies
LEARN ABOUT REDHAT
catch
catch(n) Tcl Built-In Commands catch(n)
__________________________________________________________________________________________________________________________________________________NAME
catch - Evaluate script and trap exceptional returns
SYNOPSIS
catch script ?varName?
_________________________________________________________________DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. Catch calls the Tcl interpreter recursively to exe-
cute script, and always returns without raising an error, regardless of any errors that might occur while executing script.
If script raises an error, catch will return a non-zero integer value corresponding to one of the exceptional return codes (see tcl.h for
the definitions of code values). If the varName argument is given, then the variable it names is set to the error message from interpret-
ing script.
If script does not raise an error, catch will return 0 (TCL_OK) and set the variable to the value returned from script.
Note that catch catches all exceptions, including those generated by break and continue as well as errors. The only errors that are not
caught are syntax errors found when the script is compiled. This is because the catch command only catches errors during runtime. When
the catch statement is compiled, the script is compiled as well and any syntax errors will generate a Tcl error.
EXAMPLES
The catch command may be used in an if to branch based on the success of a script.
if { [catch {open $someFile w} fid] } {
puts stderr "Could not open $someFile for writing
$fid"
exit 1
}
The catch command will not catch compiled syntax errors. The first time proc foo is called, the body will be compiled and a Tcl error will
be generated.
proc foo {} {
catch {expr {1 +- }}
}
KEYWORDS
catch, error
Tcl 8.0 catch(n)