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Change only first line of the match

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Top Forums Shell Programming and Scripting Change only first line of the match
# 15  
Old 12-31-2013
This seems to do what you want for any number of files you want to process:
Code:
#!/bin/ksh
IAm=${0##*/}
if [ $# -lt 3 ] || [ $(($# % 3)) -ne 0 ]
then    printf "Usage: %s file1 IP1 Port1 [filen IPn Portn]...\n" "$IAm" >&2
        exit 1
fi
while [ $# -gt 1 ]
do      printf "Processing file: %s, New IP: %s, New Port: %s\n" "$1" "$2" "$3"
        ed -s "$1" <<-EOF
                /^leprechaun[.]host[.]uri[.]list=raft:\/\//s,//[[:alnum:].:/]*,//$2:$3,
                w
                q
EOF
        shift 3
done

It will work whether or not you have carriage returns in your file (if they are in your input file, they will not be removed; if they are not in your input file, they will not be added).

The earlier scripts weren't working for several reasons, possibly including, but not necessarily limited to:
  1. Your sample file had two lines that match your pattern; your real file only has one.
  2. The second field in the lines after the 1st matched line had numeric strings between the 1st and 2nd periods on the line; your real file does not.
  3. Your sample input and output showed that you wanted us to add lines in increasing numeric order if numbers were missing in the sequence between the 1st and 2nd matches in your input file; your real input file has neither numeric strings nor two matching lines.
# 16  
Old 01-01-2014
Hi Don,

Thanks your valauable code.

In my Sample text file i have same searching string but the full line is not same as the one which i am going to change.So if i use sed it will also change the below line:

Code:
#example: leprechaun.host.uri.list=raft://10.1.120.154:20127,raft://10.1.122.2:21327^M


Can you let us know how this code will work for my sample file.I am passing my inputs as shown in the below code and the output i am receving:

Code:
#!/bin/ksh
file1=HostSocket.properties
IP1=rt900test.info53.com
Port1=23054
IAm=${0##*/}
if [ $# -lt 3 ] || [ $(($# % 3)) -ne 0 ]
then    printf "Usage: %s $file1 $IP1 $Port1 [filen IPn Portn]...\n" "$IAm" >&2
        exit 1
fi
while [ $# -gt 1 ]
do      printf "Processing file1: %s, New IP1: %s, New Port1: %s\n" "$1" "$2" "$3"
        ed -s "$1" <<-EOF
                /^leprechaun[.]host[.]uri[.]list=raft:\/\//s,//[[:alnum:].:/]*,//$2:$3,
                w
                q
EOF
        shift 3
done

output:

Code:
Usage: test.sh HostSocket.properties rt900test.info53.com 23054 [filen IPn Portn]...

# 17  
Old 01-02-2014
Quote:
Originally Posted by bhas85
Hi Don,

Thanks your valauable code.

In my Sample text file i have same searching string but the full line is not same as the one which i am going to change.So if i use sed it will also change the below line:

Code:
#example: leprechaun.host.uri.list=raft://10.1.120.154:20127,raft://10.1.122.2:21327^M


Can you let us know how this code will work for my sample file.I am passing my inputs as shown in the below code and the output i am receving:

Code:
#!/bin/ksh
file1=HostSocket.properties
IP1=rt900test.info53.com
Port1=23054
IAm=${0##*/}
if [ $# -lt 3 ] || [ $(($# % 3)) -ne 0 ]
then    printf "Usage: %s $file1 $IP1 $Port1 [filen IPn Portn]...\n" "$IAm" >&2
        exit 1
fi
while [ $# -gt 1 ]
do      printf "Processing file1: %s, New IP1: %s, New Port1: %s\n" "$1" "$2" "$3"
        ed -s "$1" <<-EOF
                /^leprechaun[.]host[.]uri[.]list=raft:\/\//s,//[[:alnum:].:/]*,//$2:$3,
                w
                q
EOF
        shift 3
done

output:

Code:
Usage: test.sh HostSocket.properties rt900test.info53.com 23054 [filen IPn Portn]...

Maybe I got this thread confused with another thread. I thought you had lots of files that needed to be modified in similar ways but with different IP and Port values for different files. The idea of editing your script to make it work for each different file defeats the purpose of writing a script in the first place. Adding three variables to the start of my script and changing the usage message won't make it work. Try taking the script I gave you in message #15 in this thread and invoke it like this:
Code:
test.sh HostSocket.properties rt900test.info53.com 23054

and if you have two files to be changed, you could invoke it like this:
Code:
test.sh HostSocket.properties rt900test.info53.com 23054 2ndHostSocket.properties rt900test.info53.number2.com 22222

The script is set up to process sets of the arguments where the 1st argument in each set is the name of the file to be updated, the 2nd argument in each set is the new IP to be used for that file, and the 3rd argument in each set is the Port to be used for that file.

In an earlier post I asked:
Quote:
Do you want the script to add lines as shown in your first example?
To identify the line to be changed, which of the following do we need to match at the start of a line:
and you replied:
Code:
leprechaun.host.uri.list=raft://

The script I gave you will not change the line:
Code:
#example: leprechaun.host.uri.list=raft://10.1.120.154:20127,raft://10.1.122.2:21327^M

because #example is at the start of the line; not leprechaun.... There is only one line in any of your sample input files where
Code:
leprechaun.host.uri.list=raft://

appears at the start of a line.

And, I repeat. If you have more than one line that matches a pattern, you want to change the 1st matching line, and keep all of the other lines unchanged; sed is not the tool you want to use for this project.
# 18  
Old 01-31-2014
Tha
I am very sorry for my late response.Thanks Don for your support.It works fine now.
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