There are sometimes reasons to store output from a pipeline in a variable and then print the contents of the variable, but you haven't shown us any reason to do that here. Why are you using a variable?
It is ALWAYS a good idea to tell us what operating system and shell you're using when you start a thread in the UNIX & Linux forums. Although most BSD, Linux, and UNIX system commands produce similar output when using common tools and options, there are variations. Knowing what OS and shell you're using helps us avoid suggesting code that will not work in your environment.
If you take your code:
and change it to:
what happens?
You may want to look at the man page for your shell and search for a section titled "Quoting" to see how single-quotes, double-quotes, and back-quotes affect command-line arguments.
Hi
All,
I have oracle 9i and 10g on unix. now i have 920.env and 1020.en file to set p respective enviornment.
when I excecute this commnad
. $HOME/920.env from the shell prompt it is working fine. and also same for 1020.env .
Now same command . $HOME/920.env i am putting in shell... (2 Replies)
Trying to figure out why this works:
printpwd.pl
#!/usr/bin/perl
use CGI::Carp qw( fatalsToBrowser );
print "Content-type: text/html\n\n";
$A = system("pwd");
$A = `pwd`;
print "$A\n";
^^actually that works/breaks if that makes any sense.. i get the working directory twice but when... (5 Replies)
Hi All,
I have writtern a shell script which has a sql query. I want to send the results of sql query to a shared area over a network.I also want to log the errors in a log file if the text file is not sent to shared area.
The results of sql query are spooled in TEMPFILE.
LOGFILE... (1 Reply)
i wrote a shell program in Home Directory.
and i changed to other directory.
i want to try to execute shell script in Other Dir.
it is not executed.
how can i make this script to execute in other directory also??
Thanks,
Arun (11 Replies)
Shell Scipt: temp.sh
su - <$username>
expect pass.exp
Expect script: pass.exp
#!/usr/bin/expect -f
# Login
#######################
expect "Password: " send "<$password>\r"
it comes up with Password: but doesnt take password passed throguh file. (2 Replies)
loop=y
while
do
clear
tput cup 5 15
echo -n "People Database"
echo -n "===================================="
tput cup 8 12
echo -n "L-Print Last Names"
tput cup 9 12
echo -n "F-Print First NAmes"
tput cup 10 12
echo -n "C-Print First Name, Last Name sorted by city"
tput cup 11 12... (3 Replies)
Dear All,
I have script.
Dest=""
IFS='
'
for translation in $(echo $MY_MAP)
do
t1=$(echo $translation | cut -d"=" -f1)
t2=$(echo $translation | cut -d"=" -f2| cut -d"," -f1)
if
then
Dest=$UNX/$u_product_path/$u_study_path/$UNXTR/$t2
break;
... (4 Replies)
Hi Guys,
I have one installer shell script which normally get from the dev team to install the app and it works fine for years (in IAX) the same installer/script iam trying to run in Linux 7.2 but it stuck somewhere which I cannot debug, can you help me to point out where it stuck .
here is the... (9 Replies)
Discussion started by: Riverstone
9 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)