dear as far as I know nothing wrong with backslash / and not equal ! =
Ok so there is nothing wrong with backslash:
And there is nothing wrong with regexp not matching:
I hope then you have some explanation for above behavior?
Hi friends,
This is my very first post on forum, so kindly excuse if my doubts are found too silly.
I am trying to automate a piece of routine work and this is where I am stuck at the moment-I need to grep a particular ID through a file containing many records(which start with <LRECORD> and end... (6 Replies)
Dear Experts,
I need to extract specific records from one file which has multiline records.
Input file pattern is:
============
aaaaaaaa
bbbbbbbb
asdf 1234
cccccccc
dddddddd
============
aaaaaaaa
bbbbbbbb
qwer 2345
cccccccc
dddddddd (7 Replies)
Using awk, print all the lines where field 8 is equal to x
I really did try, but this awk thing is really hard to figure out.
file1.txt"Georgia","Atlanta","2011-11-02","x","","","",""
"California","Los Angeles","2011-11-03","x","","","",""... (2 Replies)
I'm still beginner and maybe someone can help me.
I have this input:
the great warrior a, b, c
and what i want to know is, with awk, how can i detect the string with 'warrior' string on it and print the a, b, and c seperately, become like this :
Warrior Type
a
b
c
Im still very... (3 Replies)
Hi,
Do anybody know how to print out only those record that column 1 is "a" , then followed by "b"?
Input file :
a comp92 2404242 2405172
b comp92 2405303 2406323
b comp92 2408786 2410278
a comp92 2410271 2410337
a comp87 1239833 1240418
b comp87... (3 Replies)
Hi,
Anybody know how to print out the record that shown smallest number among column 3 and column 4
Case 1 Input :
37170 37196 77 51
37174 37195 73 52
37174 37194 73 53
Case 1 Output :
37170 37196 77 51
Case 2 Input :
469613 469660 73 ... (4 Replies)
Hi,
I need help on a complicated file that I am working on. I wanted to extract important info from a very huge file. It is space delimited file. I have hundred thousands of records in this file. An example content of the inputfile as below:-
##
ID Ser402 Old; 23... (2 Replies)
Discussion started by: redse171
2 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)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 v5.16.3 2010-06-11 SHELL-QUOTE(1)