I have two files. File 'a' has contents:
1|1
2|2
3|3
4|4
and file 'b' has contents:
abc|def
hij|klm
nop|qrs
tuv|wxy
I would like to prepend file 'a' to file 'b' (with pipe) such that the contents of 'b' will be:
1|1|abc|def
2|2|hij|klm
3|3|nop|qrs
4|4|tuv|wxy (3 Replies)
Hi all,
I need to insert new text and change existing text in a file. For that I used the below line in the command line and got the expected output.
sed '$a\
hi...
' shell > shell1
But I face problem when using the same in script. It is throwing the error as,
sed: command garbled:... (4 Replies)
I want to print out a directory listing, then append ] to the end of each line. I'm trying to create a list of Wiki links based on folder listings that i can just copy and paste without having to edit 100's of file listings.
Using sed i've figured out to do something like this:
sed... (4 Replies)
Hi,
I am trying to add a blank line between sets of replicate values. I have been trying to use
uniq -D -f4 input.txt > output.txt
The input is like
V2-1.0 -1.0 5500.00 4162.00 529976.06030125.0 1997A
V2-1.0 -1.0 6000.00 4285.00 ... (6 Replies)
Hello everyone, I've suddenly gotten very interested in sed and awk (and enjoying it quite a bit too) because of a large conversion project that we're working on. I'm currently stuck with a very inefficient process for processing text blocks. I'm sure someone here should be able to easily point out... (2 Replies)
hi all ,
i had the below sed command to append header at the starting of my output file ....
sed -i -e '1i saikumar suresh hemanth' output.txt
i want to append spaces to the Name saikumar how can i append with in this command ....? (1 Reply)
Prepending lines with: your, the, a or an based on 1st letter match. You'll see my problem below:
sed '/^p\|^f\|^c\|^d\|^l/ s/^/your /' list.txt > your.txt && sed '/^v\|^j\|^k\|^m\|^n\|^s/ s/^/the /' your.txt > the.txt && sed '/^b\|^g\|^h\|^q\|^r\|^t\|^w\|^z/ s/^/a /' the.txt > a.txt && sed... (10 Replies)
Looking to add text to a file, example
File example;
nodegroups:
check-hosts: L@host.domain.com,host2.domain.com,host3.domain.com
I need to take a file with a one line list of hosts separated by commas
host.domain.com,host2.domain.com,host3.domain.comand prepend the string " ... (6 Replies)
Hi All,
I have a file like below. In the field 9 I am having 14,014,3,001/009 on the records. I want to convert the field to a three digit value. For example 14 should 014 , 3 should 003
11050;11001;;CREDITTRANC;5293218;NRATL;;;11095;;-1;14;3;29=0000;1.25... (5 Replies)
I've been struggling with this one for quite a while and cannot seem to find a solution for this find/replace scenario. Perhaps I'm getting rusty.
I have a file that contains a number of metrics (exactly 3 fields per line) from a few appliances that are collected in parallel. To identify the... (3 Replies)
Discussion started by: verdepollo
3 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)