Hi All,
I have an input below.
I would want to print the 2nd to 5th term leaving the same number of spaces in between each term to be intact.
Here in the example, there are 4 spacings between term " ABC " and " 111 ", and i tried the below awk codes but they don;t work. Can anybody give me... (3 Replies)
I have an awk script like below
function abs(val) {
return val > 0 ? val : -val
}
# 1. Main input loop, executed for each line of input
BEGIN { RS = ORS = ">" }
{ if ( NF > 2 )
{
if ( abs( $1 - $(NF-2) ) < 40 ) { print }
}
}
The input file is something like... (2 Replies)
Hi,
I am having a file which is fix length and comma seperated. And I want to replace values for one column.
I am reading file line by line in variable $LINE and then replacing the string.
Problem is after changing value and writing new file temp5.txt, formating of original file is getting... (8 Replies)
Hi all,
I have a file with 3 columns separated by space. Each column has a heading. I want to sort according to the values in the 2nd column (ascending order).
Ex.
Name rank direction
goory 0.05 --+
laby 0.0006 ---
namy 0.31 -+-
....etc.
Output should be
Name rank direction
laby... (3 Replies)
Hi all,
Hello everyone, my first post here :). I tried to search the forum but I didn't find exactly what I was looking for...
I need to zip/tar files across entire filesystem which are more 3+ years old but leave folder structure intact. If the script locates tar/zip files they are more... (1 Reply)
Hi All,
I am trying write a simple command using AWK and SED to this but without any success.
Here is what I am using:
head -1 test1.txt>test2.txt|sed '1d;$d' test1.txt|awk '{print substr($0,0,(length($0)-2))}' >>test2.txt|tail -1 test1.txt>>test2.txt
Input:
Header
1234567
abcdefgh... (2 Replies)
Hi Unix Gurus,
I need to grep for a block that is between a start and end keyword and then in between I need to find and replace a keyword.
for eg: I need to search between Test = 000; and Test = 000; and find K9 and replace with M9
INPUT FILE
Define {
Replace = K9;
Test =... (6 Replies)
Hello friends,
I have a file with duplicate lines. I could eliminate duplicate lines by running
sort <file> |uniq >uniq_file and it works fine BUT it changes the order of the entries as it we did "sort".
I need to remove duplicates and also need to keep the order/sequence of entries. I... (1 Reply)
I have multiple (~80) files (some can be as big as 30GB of >1 billion of lines!) to grep on a pattern, and piped the match to a single file. I have a 96-core machine so that each grep job was sent to the background to speed up the search:
file1.tab
chr1A_part1 123241847 123241848... (6 Replies)
Discussion started by: yifangt
6 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)