01-02-2008
Line deletion help using perl -ne
Hi all,
I know the one liner to delete all the lines in a file which matches a pattern
i.e
perl -i.old -ne 'print unless /pattern/' file
Now i need the perl onliner to delete all the lines which doesnt match the pattern. Also what is the difference between perl -i and perl -i.old.
Does perl -i.old archive the existing file?
Your help in this will be appreciated.
Thanks in advance.
Lijju
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello Friends,
I want to delete all the "*.trg" files in a directory but i don't want to do it by
system("rm -r *.trg");
Can i do it thru unlink or by any other mean
Thanks,
Pulkit (1 Reply)
Discussion started by: pulkit
1 Replies
2. Shell Programming and Scripting
Dear All,
I am looking for an option in perl using which i could delete empty lines in a file.
Or
the alternative of sed '/^$/d' <filename> in perl. Sed is not working in my perl script :(
Pls help me out .
Thanks,
VG (4 Replies)
Discussion started by: vguleria
4 Replies
3. Shell Programming and Scripting
Hi,
Can anyone know how to use perl to merge the following multi-line information which beginning with "BAM" into one line. For each line need to delete the return and add a space. Please see the red color line.
******Org. Multi-line)
BAM admin 101.203.57.22 ... (3 Replies)
Discussion started by: happyday
3 Replies
4. Shell Programming and Scripting
Hello,
Did anyone know how to write a perl script to merge the multi-line into a single line where each line with start at timestamp
Input-->
timestamp=2009-11-10-04.55.20.829347;
a;
b;
c;
timestamp=2009-11-10-04.55.20.829347;
aa;
bb;
cc; (5 Replies)
Discussion started by: happyday
5 Replies
5. Shell Programming and Scripting
Hi,
I have a file with four types of lines:
@HWUSI-EAS656_0022:8:1:175:376#0/1
CTCGACACGCTGGTGGAGATCCTCGGCCTGACCGAGGACGACCGGGCCATCTTCGAGCAGCGC
+
BBBBBBBA?AABB;<=B9<===AA1AA==>99===.9?:9A4A956%%%%%%%%%%%%%%%%%
I want to remove the first 6 characters of every second line. This means in... (10 Replies)
Discussion started by: s052866
10 Replies
6. Shell Programming and Scripting
so in unix this command works works and shows me a list of directories
find . -name \*.xls -exec dirname {} \; | sort -u | > list.txt
but when i try running a perl script to run this command
my $query = 'find . -name \*.xls -exec dirname {} \; | sort -u | > list.txt';... (2 Replies)
Discussion started by: kpddong
2 Replies
7. Shell Programming and Scripting
Unix box server version
***********
>uname -r
B.11.00
>echo $SHELL
/usr/bin/ksh
--> in this server, I have the path like /IMbuild/dev/im0serv1
---> in that directory I have the folders startup(.jsp files nearly 100 jsp's ) and scripts(contains .js files nearly 100 files) ... (9 Replies)
Discussion started by: pasam
9 Replies
8. UNIX for Dummies Questions & Answers
I want to delete all the blank lines from a file before a certain line number. e.g.
Input file (n: denotes line number)
1: a
2:
3: b
4: c
5:
6: d
I want to delete all blank lines before line number 3, such that my output is:
a
b
c
d
I see that sed '/^$/d' in_file works... (9 Replies)
Discussion started by: jawsnnn
9 Replies
9. Shell Programming and Scripting
Hi All
I have a .csv file which is showing data as
ESP Client,ESP Engagement,Misc_Projects_120101,DEFAULT,HA,Unknown,No,Unknown,201704,4.1,Unknown,AAA,Collected-Done,"she,joy.",200111,Unknown,Full Time,,Delivery_DONE AMO,Approved,2012-12-03,2012-12-06,2012-12-06,"Occupied Hours ... (7 Replies)
Discussion started by: adisky123
7 Replies
10. Shell Programming and Scripting
I am looking for help in processing of those options: '-n' or '-p'
I understand what they do and how to use them.
But, I would like to use them with more than one file (and without any shell-loop; loading the 'perl' once.)
I did try it and -n works on 2 files.
Question is:
- is it possible to... (6 Replies)
Discussion started by: alex_5161
6 Replies
LEARN ABOUT SUNOS
fmlgrep
fmlgrep(1F) FMLI Commands fmlgrep(1F)
NAME
fmlgrep - search a file for a pattern
SYNOPSIS
fmlgrep [-b] [-c] [-i] [-l] [-n] [-s] [-v] limited_regular_expression [filename...]
DESCRIPTION
fmlgrep searches filename for a pattern and prints all lines that contain that pattern. fmlgrep uses limited regular expressions (expres-
sions that have string values that use a subset of the possible alphanumeric and special characters) like those described on the regexp(5)
manual page to match the patterns. It uses a compact non-deterministic algorithm.
Be careful when using FMLI special characters (for instance, $, `, ', ") in limited_regular_expression. It is safest to enclose the entire
limited_regular_expression in single quotes ' ... '.
If filename is not specified, fmlgrep assumes standard input. Normally, each line matched is copied to standard output. The file name is
printed before each line matched if there is more than one input file.
OPTIONS
The following options are supported:
-b Precede each line by the block number on which it was found. This can be useful in locating block numbers by context (first block
is 0).
-c Print only a count of the lines that contain the pattern.
-i Ignore upper/lower case distinction during comparisons.
-l Print only the names of files with matching lines, separated by new-lines. Does not repeat the names of files when the pattern is
found more than once.
-n Precede each line by its line number in the file (first line is 1).
-s Suppress error messages about nonexistent or unreadable files.
-v Print all lines except those that contain the pattern.
EXIT STATUS
The following exit values are returned:
0 if the pattern is found (that is, TRUE)
1 if the pattern is not found (that is, FALSE)
2 if an invalid expression was used or filename is inaccessible
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
egrep(1), fgrep(1), fmlcut(1F), grep(1), attributes(5), regexp(5)
NOTES
Lines are limited to BUFSIZ characters; longer lines are truncated. BUFSIZ is defined in /usr/include/stdio.h.
If there is a line with embedded nulls, fmlgrep will only match up to the first null; if it matches, it will print the entire line.
SunOS 5.10 28 Mar 1995 fmlgrep(1F)