I have a file name called fruits.
In this file the prices keep on changing & the order in which fruits are listed keep on changing.
$ cat fruits
fruitname price/pound
redapples 30
grapes 50
oranges 20
$echo $custom_price
35
What I want to do is that if the file "fruits" contains... (1 Reply)
I know in vi you can do
:%s/replaceme/withthis/
but if i want to find all lines say without a # at the begining and I want to put it in how would that command be formatted? I can't figure it out for the life of me.
#comment
blah1
hey1
grrr1
#comment
#blah1
#hey1
#grrr1 (5 Replies)
i'm writing a script that will extract and substitute a certain part of a data.
i'm having trouble with the substituting part ...
Here's my data looks like:
01/01/08-001-23:46:18-01/01/08-23:50:43
01/01/08-003-23:45:19-01/01/08-23:55:49
01/01/08-005-23:52:18-01/01/08-23:58:52
i want to... (6 Replies)
Hi,
I have query terms like this:
a) apple bannana
b) apple bannana AND chickko
c) "milk shake" OR Graphes orange
whereever there is space substitue with AND operator.
I tried like this: (2 Replies)
My question is how would I substitute for ceratain number of occurences in a line? If this is my input
rjohns BFSTDBS01 Standard Silver NPRO30DINCR 2 Client
Is it possible to change the first 3 occurences of space " " to a comma? (7 Replies)
Hey all,
I am trying to disable a certain cronjob before I run a backup. I want to be able to add/remove a "#" from the beginning on the crontab line it is located on.
Here is the crontab:
46 11 * * * /etc/webmin/cron/tempdelete.pl
@daily /etc/webmin/time/sync.pl
*/5 * * * *... (4 Replies)
I usually use :
Code:
awk '{gsub(/xxx/,"yyy");print}'
to substitute xxx with yyy.
I have a problem substitute an expression like
Code:
x ' y
Because of the ( ' )
Any idea on how to get over this problem?
Thanks (2 Replies)
Hi there,
i am updating a file on UNIX and have many lines as per below :
listen:x:37:4:Network Admin:/usr/net/nls:
i would like to substitute from the :/usr to the end of the line.
so at the moment im using this :
:s/"\/$/ /g
but i get an error.can anyone help?
thank you (3 Replies)
Hi
I have 3 files in total. file 1 is enriched.txt file2 is repressed.txt and file 3 is my content.txt
What i need is query the content file against both enriched and repressed and wherever the gensymbol is same in both the files then add a yes value against it
file1
Gene
ABC
XYZ
MNO... (12 Replies)
HI
I am trying to use the following code in the shell script (using grep)
usage()
{
echo "Usage: ./$0 <file name> <interval> <pattern>"
}
METRICS_FILE=$1
INTERVAL=$2
PATTERN="$3"
..
if
then
PATTERN="grep Gx"
fi
COUNT=`cat ${METRICS_FILE} | "${PATTERN}" |egrep... (8 Replies)
Discussion started by: asifansari
8 Replies
LEARN ABOUT MOJAVE
test::trap::builder::systemsafe
Test::Trap::Builder::SystemSafe(3) User Contributed Perl Documentation Test::Trap::Builder::SystemSafe(3)NAME
Test::Trap::Builder::SystemSafe - "Safe" output layer backend using File::Temp
VERSION
Version 0.2.3
DESCRIPTION
This module provides an implementation systemsafe, based on File::Temp, for the trap's output layers. This implementation insists on
reopening the output file handles with the same descriptors, and therefore, unlike Test::Trap::Builder::TempFile and
Test::Trap::Builder::PerlIO, is able to trap output from forked-off processes, including system().
See also Test::Trap (:stdout and :stderr) and Test::Trap::Builder (output_layer).
CAVEATS
Using File::Temp, we need privileges to create tempfiles.
We need disk space for the output of every trap (it should clean up after the trap is sprung).
Disk access may be slow -- certainly compared to the in-memory files of PerlIO.
If the file handle we try to trap using this backend is on an in-memory file, it would not be available to other processes in any case.
Rather than change the semantics of the trapped code or silently fail to trap output from forked-off processes, we just raise an exception
in this case.
If there is another file handle with the same descriptor (f ex after an "open OTHER, '>&=', THIS"), we can't get that file descriptor.
Rather than silently fail, we again raise an exception.
Threads? No idea. It might even work correctly.
BUGS
Please report any bugs or feature requests directly to the author.
AUTHOR
Eirik Berg Hanssen, "<ebhanssen@allverden.no>"
COPYRIGHT & LICENSE
Copyright 2006-2012 Eirik Berg Hanssen, All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.18.2 2017-10-06 Test::Trap::Builder::SystemSafe(3)