Visit Our UNIX and Linux User Community


PERL error handling


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting PERL error handling
# 1  
Old 08-31-2011
PERL error handling

I have a PERL command line embedded in a UNIX script. The script doesn't handle errors coming out of this command. I'm processing large files and occassionally I run out of disk space and end up with half a file.

Code:
perl -p -e 's/\n/\r\n/g' < TR_TMP_$4 > $4

How do I handle errors coming out of this type of command?

Last edited by radoulov; 08-31-2011 at 11:05 AM.. Reason: Code tags.
# 2  
Old 08-31-2011
Well you should consider dos2unix (may br dos2ux on your box) to clean up windows carriage returns. It was meant to do that. And has error handling.

Otherwise, you have to do error handling inside the perl script itself.
You can add external checks:
Code:
# note: this is kind of generalized for basic file I/O checking, and is overkill for this particular perl one liner.
if [ -r TR_TMP_$4 ] ; then
   touch $4 ||  echo "cannot write $4" && exit
   perl -p -e 's/\n/\r\n/g' < TR_TMP_$4 > $4
   if [ $? -ne 0 ] ; then
      echo "fatal error "
      exit
   fi
else
   echo "cannot read TR_TMP_$4"
   exit
fi

Note: consider forming TR_TMP_$4 as TR_TMP_${4} It is two more keystrokes but if you do it consistently it will save ambiguity in reading code, and has helped me catch mistakes lots faster. YMMV.

Last edited by jim mcnamara; 08-31-2011 at 01:00 PM..

Previous Thread | Next Thread
Test Your Knowledge in Computers #154
Difficulty: Easy
Inspur K-UX is a Linux distribution certified as UNIX 03 compliant.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Perl : How is file handling working here??

Hi, I have a perl script which is just reading from the file but what I would like to understand is how the counter is moving without using the loop in the script. Below are the details: $ more /tmp/abc.txt This is 0 This is 1 This is 2 This is 3 This is 4 This is 5 This is 6 This... (2 Replies)
Discussion started by: siddharthjindal
2 Replies

2. Shell Programming and Scripting

Perl file handling error

Hi, I am reading and file and writting each word to other file. where I have used array to store the data. I am getting below error as "Use of uninitialized value in concatenation (.) or string at customize_split_raw.pl line 51, <IN_FILE> " Where my line 51 code is 50 foreach... (8 Replies)
Discussion started by: Beginer123
8 Replies

3. UNIX for Dummies Questions & Answers

Error Handling using ISQL for oracle connection in Perl

Hi Am making connection to oracle using ISQL as shown in the code. This code is just a minor part of a big code. I want to capture the error if the password/login is wrong or if connection is not made. I need to capture the error code also. Also, If such an error occurs, i need to exit out... (4 Replies)
Discussion started by: irudayaraj
4 Replies

4. Programming

Perl help for file handling

$# some text $$ some text $@ some text $$. some text Mg1 some text Mg2 some text . . . Mg10 some text The above 10 lines are to be extracted except the lines starting from $#,$$.,... (4 Replies)
Discussion started by: baig.abdul
4 Replies

5. Infrastructure Monitoring

Perl Error Handling Problem

I can get this working, but if something is down I get an error and the script does not move on. I can not get the "else" function working. What might I be doing wrong? use SNMP::Simple my %ios = (); $list="list.list"; open(DAT, $list) || die("Can't Open List"); @raw_data=<DAT>;... (4 Replies)
Discussion started by: mrlayance
4 Replies

6. Shell Programming and Scripting

Handling Parameters in Perl

Hi All, I'm pretty new to the forum and also to UNIX. I have a requirement for which I need some help. I have a script (example.script) where I get user inputs using the read command. I would need to pass the read-fetched input to a perl command (explained below) in my script. The part which... (3 Replies)
Discussion started by: bharath.gct
3 Replies

7. Shell Programming and Scripting

Perl and Sockets - Error handling

Hello all, I have created a Perl script that tries to open connections to various systems on different ports in order to see if the machines are reachable, the ports are open, etc. There appears to be a difference between Solaris (10) and Linux (RH/Oracle and Ubuntu) in the status or error it... (4 Replies)
Discussion started by: Hollinch
4 Replies

8. Shell Programming and Scripting

special characters handling in perl

Hi, Here is my piece of code-- sub per_user_qna_detail { for($index=0;$index<@records;$index++) { if($records =~ m/^(.*)\s*Morocco.*Entering\s*Module::authenticate/) { printf "INSIDE per_user_qna_detail on LINE NO $index\n"; $Time_Stamp = $1;... (0 Replies)
Discussion started by: namishtiwari
0 Replies

9. Programming

XML Handling in Perl

Hi there, I'm newby in perl and XML. I can read and parse Xml with XML-Node upper XML::Parser, but how can I create XML tags and pack my individual data in it then send through socket. PLZ lead me :) Thanks in Advance. (1 Reply)
Discussion started by: Zaxon
1 Replies

10. Shell Programming and Scripting

Signal handling in Perl

Guys, I'm doing signal handling in Perl. I'm trying to catch ^C signal inside the script. There two scripts : one shell script and one perl script. The shell script calls the perl script. For e.g. shell script a.sh and perl scipt sig.pl. Shell script a.sh looks something like this :... (6 Replies)
Discussion started by: obelix
6 Replies

Featured Tech Videos