$1 is typically a positional parameter used in a script, or some programs which accept arguments. Regular expressions use a different notation, such as \1, \2, etc, and the & used above means:
Quote:
An ampersand (``&'') appearing in the replacement is replaced by the string matching the RE
Hello all -
I've searched this forum, but was unable to find out the info I need.
I'm trying to mount (nfs mount) a directory on another box from my Linux machine.
The mount point resides on a Tru64 digital unix machine. The machine trying to do the mount is a Linux machine (redhat 8.0).
... (2 Replies)
I have a file "dbshot.xml" that contains lines that need replacing in a batch format but the parameters are based on two lines.
Ex.
<role roletype="01">
<status>1
needs to be changed to
<role roletype="01">
<status>0
I can't use simply "<status>1" replace since the... (2 Replies)
the command "nawk" returns the error command cannot be found in my unix system.
Is there a specific library i need to have to use this command?
I tried, the whereis command and it returns nothing.
if there is nothing to do, what command can i use to replace this nawk command?
Appreciate some... (4 Replies)
I got a sample file like this.
$ cat test
12|13|100|s
12|13|100|s
100|13|100|s
12|13|100|s
I want to replace all 100 by 2000 only in 3rd field using "awk"
This is replacing all 100's :-(
$ awk -F "|" '{gsub( /100/,"2000");print}' test
12|13|2000|s
12|13|2000|s
2000|13|2000|s... (5 Replies)
Hello guys,
In my script, I need to add two other routines where I Manipulate the files with a 'x'
The routine looks at CLI named qip-getobjectprof that references a input file named hosts_list.txt
Then I use the CLI named qip-setobject to set the orignal name with an 'x'and move the... (3 Replies)
We have year folder say in a path /opt/informat/Archive a folder 2012.
And in the same folder /opt/informat/Archive we have different folders month based, like 201210, 201211, 201212, this have data for each month, ie files. Now time to time i need to move the monthly folders to the main folder... (1 Reply)
Discussion started by: raghavraok
1 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)