I have the following string stored in a variable from a file
sbCvgXfsuupllsucpp11-aWa
I want to use sed to search for the string in a second file: FileSys.dat
sed -n "${obid}" FileSys.dat
I'm getting "sed: command garbled: sbCvgXfsuupllsucpp11-aWa"
The syntax seems fine...anyone... (2 Replies)
Hi
I have a file in which there is list of files.
eg:
$path1/file1
$path1/file2
$path2/file3
I am trying to read this file in other script.However the value of variable i.e. $path1 and $path2 is not replaced by its value.
How to do it ?
I am trying:
while read line
do
echo... (2 Replies)
Hi everybody,
I am trying to do the thing you see in the title, and I can't simply do
a=$(svn up)
echo $a
because the program (svn) gives output on lots of lines and in the variable the output is stored on only one line (resulting in a horribly formatted text). Any tips?
Thanks,... (2 Replies)
Hi everyone,
Ok here's the scenario.
I have a control file like this.
component1,file1,file2,file3,file4,file5
component2,file1,file2,file3,file4,file5I want to do a while loop here to read all files for each component.
file_count=2
while ]
do
file_name=`cat list.txt | grep... (2 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
couldn't print out stored variable in awk
2. Relevant commands, code, scripts, algorithms:
i have in a... (5 Replies)
Simple enough problem I think, I just can't seem to get it right.
The below doesn't work as intended, it's just a function defined in a much larger script:
CheckValues() {
for field in \
Group_ID \
Group_Title \
Rule_ID \
Rule_Severity \
... (2 Replies)
Hello guys,
This truly is a newbie question. I'm trying to make a loop to execute simultaneous commands indefinitely while using variable. Here is how my mess looks like (this is just an example):
#!/bin/bash
IP=`shuf -n 1 IP.txt` # I figured this would be easier to select random lines... (4 Replies)
Hello All,
Maybe I'm Missing something here but I have NOOO idea what the heck is going on with this....?
I have a Variable that contains a PATTERN of what I'm considering "Illegal Characters". So what I'm doing is looping
through a string containing some of these "Illegal Characters". Now... (5 Replies)
Hi All,
I have a file which has hundred of records with fixed number of fields. In each record there is set of 8 characters which represent the duration of that activity. I want to sum up the duration present in all the records for a report. The problem is the duration changes per record so I... (5 Replies)
Hi folks,
A really dumb question as I've wasted far too long trying to get this to work.... (on RH bash)
I have an array:
m0='<hello>'
m0='<there>'
m0='<fred>'
v0='<goodbye>'
v0='<again>'
v0='<john>'
in my code I calculate the value of the variable to output and if I echo it, I... (2 Replies)
Perl::Critic::Policy::ErrorHandling::RequireCheckingRetuUserlContributedPerl::Critic::Policy::ErrorHandling::RequireCheckingReturnValueOfEval(3pm)NAME
Perl::Critic::Policy::ErrorHandling::RequireCheckingReturnValueOfEval - You can't depend upon the value of "$@"/"$EVAL_ERROR" to tell
whether an "eval" failed.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
A common idiom in perl for dealing with possible errors is to use "eval" followed by a check of $@/$EVAL_ERROR:
eval {
...
};
if ($EVAL_ERROR) {
...
}
There's a problem with this: the value of $EVAL_ERROR can change between the end of the "eval" and the "if" statement. The issue is object
destructors:
package Foo;
...
sub DESTROY {
...
eval { ... };
...
}
package main;
eval {
my $foo = Foo->new();
...
};
if ($EVAL_ERROR) {
...
}
Assuming there are no other references to $foo created, when the "eval" block in "main" is exited, "Foo::DESTROY()" will be invoked,
regardless of whether the "eval" finished normally or not. If the "eval" in "main" fails, but the "eval" in "Foo::DESTROY()" succeeds,
then $EVAL_ERROR will be empty by the time that the "if" is executed. Additional issues arise if you depend upon the exact contents of
$EVAL_ERROR and both "eval"s fail, because the messages from both will be concatenated.
Even if there isn't an "eval" directly in the "DESTROY()" method code, it may invoke code that does use "eval" or otherwise affects
$EVAL_ERROR.
The solution is to ensure that, upon normal exit, an "eval" returns a true value and to test that value:
# Constructors are no problem.
my $object = eval { Class->new() };
# To cover the possiblity that an operation may correctly return a
# false value, end the block with "1":
if ( eval { something(); 1 } ) {
...
}
eval {
...
1;
}
or do {
# Error handling here
};
Unfortunately, you can't use the "defined" function to test the result; "eval" returns an empty string on failure.
Various modules have been written to take some of the pain out of properly localizing and checking $@/$EVAL_ERROR. For example:
use Try::Tiny;
try {
...
} catch {
# Error handling here;
# The exception is in $_/$ARG, not $@/$EVAL_ERROR.
}; # Note semicolon.
"But we don't use DESTROY() anywhere in our code!" you say. That may be the case, but do any of the third-party modules you use have them?
What about any you may use in the future or updated versions of the ones you already use?
CONFIGURATION
This Policy is not configurable except for the standard options.
SEE ALSO
See thread on perl5-porters starting here: http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-06/msg00537.html
<http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-06/msg00537.html>.
For a nice, easy, non-magical way of properly handling exceptions, see Try::Tiny.
AUTHOR
Elliot Shank "<perl@galumph.com>"
COPYRIGHT
Copyright (c) 2008-2011 Elliot Shank.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license
can be found in the LICENSE file included with this module.
perl v5.14.22012Perl::Critic::Policy::ErrorHandling::RequireCheckingReturnValueOfEval(3pm)