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I have a requirement where in I need to change the contents of a file say xyz.cfg. the file contains values like:
group address=127.8.8.8 port=7845 Jboss username=xyz_ITR3 I want to change this content when ever needed through a shell script and save the file. Changed content can look like:
group address=127.8.7.7 port=7822 Jboss username=xyz_ITR4 How can i achieve this using shell script by taking user input or otherwise?
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Usually, when you run a cp command, it overwrites the destination file(s) or directory as shown. To run cp in interactive mode so that it prompts you before overwriting an existing file or directory, use the -i flag as shown.
Find and replace text within a file using sed command The procedure to change the text in files under Linux/Unix using sed: Use Stream EDitor (sed) as follows: sed -i 's/old-text/new-text/g' input.txt. The s is the substitute command of sed for find and replace.
To replace content in a file, you must search for the particular file string. The 'sed' command is used to replace any string in a file using a bash script. This command can be used in various ways to replace the content of a file in bash. The 'awk' command can also be used to replace the string in a file.
How about something like:
#!/bin/bash addr=$1 port=$2 user=$3 sed -i -e "s/\(address=\).*/\1$1/" \ -e "s/\(port=\).*/\1$2/" \ -e "s/\(username=\).*/\1$3/" xyz.cfg Where $1,$2 and $3 are the arguments passed to the script. Save it a file such as script.sh and make sure it executable with chmod +x script.sh then you can run it like:
$ ./script.sh 127.8.7.7 7822 xyz_ITR4 $ cat xyz.cfg group address=127.8.7.7 port=7822 Jboss username=xyz_ITR4 This gives you the basic structure however you would want to think about validating input ect.
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