It assumes the vertical bar (|) does not exist in either input file. You could also write the whole solution with awk rather than using two processes; it's not as "clean looking" but should be more efficient.
Last edited by agama; 02-13-2012 at 11:31 PM..
Reason: remove testing extras
I wonder if any body can help me with a command i am struggling with. I have a file with around 400 lines in, in a program i have it pulls out each line at a time so that data from the line can be cross referenced with another file. If it finds a match it pulls out a ocde from the second file, this... (5 Replies)
Hello everyone,
This is Rameshreddy. I like this forum and its nice to share everyone's experience here and one can learn a lot from here. Appreciate the moderators especially.
Coming to my question i have 2 files and i want to paste them with specific number of tabs as delimiters... (4 Replies)
Hi.
I have an interesting problem and i couldn't find out the solution.
I have two variables in which there are a lot of lines finished by \n. I would like to concatenate this two variables into one in this format:
var1var2
var1var2
.
.
.
I could do this simply by command paste but it works... (32 Replies)
I have a file which contains 3 fields separated by tabs example
andrew kid baker
I need to swap kid and baker using cut and paste commands how is this to be done?
Thanks (1 Reply)
I have a file which contains 3 fields separated by tabs example
andrew kid baker
I need to swap kid and baker using cut and paste commands how is this to be done?
Thanks (3 Replies)
Hello. I've made a simple script which asks the user to input a hash and then runs a command that replaces the variable $hash with what the user inserted. The ting is that when the programm asks for input I can't paste anything there..! any clues?? :wall: (8 Replies)
Please help me. This is simple, but urgent problem for me. :(
I have a two files
file1
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
.....
file2
11 12 13 14 15
11 12 13 14 15
11 12 13 14 15
.....
1) I hope to make a new file, file 3, that consists of 2nd... (2 Replies)
How can I accomplish this? I basically want to merge two variables onto the same line. I can do it with two FILES this way:
$ cat /tmp/users_in.list | awk -F "," '{print $2}' | cut -c -1 > first.initial
$ awk -F "," '{print $1}' /tmp/users_in.list | awk '{print $1}' > last.name
$ paste... (5 Replies)
Hi,
I am facing issue with paste command. It is adding spaces or tab in between.
I have say 3 files with below data
File_1
TH
THI
THIS I
File_2
IS IS
S IS RE
S
File_3
RECORD 1
CORD 2
IS RECORD 3 (3 Replies)
Discussion started by: Simanto
3 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)