double square brackets will evaluate condition, and based on true or false flow will work
Single square brackets requires a value to evaluate for eg. if [ $var -eq 0 ]; then ... fi
Your IF syntax will work fine. You can use following to reduce OR:
Code:
if [[ `echo "$logLine" | egrep "$failRegex|$failRegex1"` ]]
hi all,
i am new to UNIX. this is my first time using Ubuntu. i need to do this for my fyp.
i am using an artificial neural network model to predict the yield strength of steel. the shell script used to execute this model is as shown here:
#Thomas Sourmail, Cambridge University /... (4 Replies)
I have this script someone very kindly help me write last year which loops through all files in a folder and does a command.
I need to modify it to loop through all sub-folders of a main folder and only perform the command on files modified after Jan 1st 2008. And I need the command to place the... (3 Replies)
Hi users,
I am on a beginner level and just joined this site.
I have created a simple .ksh file in the following manner
cat <<EOF >mfile
#!/bin/ksh
echo "hello world"
EOF
Request for some help with 2 cases
1. now i would like to add a second line after the first echo command... (4 Replies)
I need to replace the line daemon ntpd $OPTIONS in the following script with daemon ntpd $OPTIONS 2>&1 > /var/log/ntpd.log &
what will happen?
The idea of replacing is to capture the output on the console into ntpd.log file.
Will this work?
... (1 Reply)
Hi freinds
I have a small problem I want u to help me in, I have a syslog server and configured it to send me email automatically, I get a small perl script to help me in, and tested it to send alerts to root and it worked successfully without any problems
Now I want to send it outside, I... (4 Replies)
Hi,
I am new to shell programming, and want to know is it possible to change the contents of file using script?
for example, if want to search 2 words and want to replace these words with 2 new words.
Regards,
Manoj (4 Replies)
Hi,
I have xml documents that I want to change a value in, I can do it using sed in a text document but not the xml document. I have read other posts that allow the change between tags but the part I wish to change is only a small part of data with the tags.
e.g.
<?xml version="1.0"... (2 Replies)
Hello,
I have a shell script which calls for an existing script with appropriate parameters. It looks something like this.
--------------------------------------------------------------------------
#!/bin/bash
sh /root/ams_rc stop_shepherd > /dev/null
sleep 30
sh /root/ams_rc... (9 Replies)
I have the records in the format
one row
0009714494919I MY010727408948010 NNNNNN N PUSAAR727408948010 R007YM08705 9602002 S 111+0360832-0937348
I want to get it int the format
0009714494919I MY010727408948010 NNNNNN N PUSAAR727408948010 R007YM08705 9602002 S ... (2 Replies)
Discussion started by: sonam273
2 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)