08-01-2008
Quote:
Originally Posted by
4scriptmoni
I like the sed one more, its just less complicated command.
Good guy! ;-))
Quote:
But both output to the screen I need it to write to that same file.
I tried
[...]
Is that the best way ?
Yes, more or less. sed principally does not overwrite the file it works on, so you have to save its results to a temporary file and copy/move the contents over the original afterwards. You can use "mv" instead of "cp", because you don't need a save copy of the results file, but thats a minor issue:
mv (instead of cp) new.txt servicegroup-24x7-comm.cfg
Quote:
Also I need to pass a variable to that command how do it do??
[...]
that prints $LINEX
The reason is, that sed commands might contain characters which have special meaning to the shell. To prevent the shell from being confused we usually surround all sed programs with single quotes, which do exactly this:
sed
'some_commands
' file > file.new
Unfortunately this also prevents the special character "$" to be interpreted: An expression like "$variable" is in fact a command to the shell, saying: replace the string "$variable" with the content of the variable "variable". After preventing this interpretation this mechanism doesn't work any more, which is why you get the result "$LINEX" instead of the content of the variable LINEX. Therefore the solution is to find a way to exclude the variable expression from the single-quoted string:
sed '/alias 24x7-comunicacions/a\'"$LINEX" $FILECFG
I hope this helps.
bakunin
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I need to insert a file called temp_impact (which has about 15 lines in it) to a file called 11.23cfg starting at line 33. I searched the forums and found the
sed '34i\
test' 11.23cfg > newfile
That will enter word test at the appropriate line, but i need the entire file dumped there. Any... (4 Replies)
Discussion started by: insania
4 Replies
2. Shell Programming and Scripting
how to insert a extra line in a text file using a sh command
iam trying to think of a way to add a extra line but without deleting the whole text
do anyone have any ideas (2 Replies)
Discussion started by: bhaviknp
2 Replies
3. Shell Programming and Scripting
Dear Folks :),
I am new to UNIX scripting and I do not know how can I insert some text in the first column of a UNIX text file at command promtp.
I can do this in vi editor by using this command :g/^/s//BBB_
e,g I have a file named as Test.dat and it containins below text:
michal... (4 Replies)
Discussion started by: Muhammad Afzal
4 Replies
4. Shell Programming and Scripting
I can't seem to get sed to allow me to insert text in the first line of an empty file. I have a file.txt that is a 0 byte file. I want sed to insert " fooBar" onto the first line. I've tried a few options and nothing seems to work. They work just fine if there's text in the file tho. Help? (4 Replies)
Discussion started by: DC Slick
4 Replies
5. Shell Programming and Scripting
sed '1r file.txt' <source.txt >desti.txt
This example will insert 'file.txt' between line 1 and 2 of source.txt.
sed '0r file.txt' <source.txt >desti.txt
gives an error message.
Does anyone know how 'sed' can insert 'file.txt' before the first line of source.txt? (18 Replies)
Discussion started by: psve
18 Replies
6. UNIX for Dummies Questions & Answers
Hello,
I am trying to add a line (usually just a word) to some text files in a directory that are already sorted. I just don't want to run the sort command again because it can take a long time when the text or log files are really huge. I have a bashscript that will take in the 1st argument... (7 Replies)
Discussion started by: raptor25
7 Replies
7. UNIX for Dummies Questions & Answers
I want to insert a line with text after the 9th line of a text file. How would I do this using sed or awk? (2 Replies)
Discussion started by: lost.identity
2 Replies
8. Shell Programming and Scripting
I have a test file that I want to read and insert only certain lines into the
the table based on a filter.
1. Rread the log file 12 Hours back Getdate() -12 Hours
2. Extract the following information on for lines that say "DUMP is
complete"
A. Date
B. Database Name
C.... (2 Replies)
Discussion started by: JolietJake
2 Replies
9. UNIX for Beginners Questions & Answers
Hi All,
I am using UNix Sun OS sun4u sparc SUNW,SPARC-Enterprise
My intention is to insert a line of text after 13th line of every file inside a particular directory.
While trying to do it for a single file , i am using sed
sed '3 i this is the 4th line' filename
sed: command garbled: 3... (5 Replies)
Discussion started by: gotamp
5 Replies
10. Shell Programming and Scripting
I am new to Perl. I wrote a Perl program that inserts text "EnableScrollableCursors=3" after a section of contexts in the odbc.ini file matches a variable in an array list. "EnableScrollableCursors=3" is added to a newline before whitespaces separate each section of contexts in the odbc.ini.
... (0 Replies)
Discussion started by: dellanicholson
0 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)