How to replace a pattern in SED shell script?
The first part is quite simple, finding a commented network.host and replacing it with an uncommented one with a different value can be done with: The -i option does an in-place modification, so it will replace your current elasticsearch.yml file. (You can save a backup of it, for instance elasticsearch.yml.bak by using -i.bak instead.)
How to use regex search and replace in Bash?
Note that the subsequent -e ‘s are processed in order. Also, the g flag for the expression will match all occurrences in the input. You can also pick your favorite tool using this method, i.e. perl, awk, e.g.: This may allow you to do more creative matches…
How to search a string using full regex syntax?
Unfortunately the pattern field doesn’t seem to support full regex syntax (if I use . or \\s, for example, it tries to match the literal characters). How can I search/replace a string using full regex syntax?
How to find a file matching with certain pattern?
Let say your file is following this pattern file-1.2.0-SNAPSHOT.txt so it can be like file-1.2.0-SNAPSHOT.txt or file-1.3.0-SNAPSHOT.txt or file-1.5.1-SNAPSHOT.txt etc. then you can get the files using find command like this :- It will give you all the files which ends with SNAPSHOT.txt and then you can use it to do your work.
How to search and replace in a shell script?
You can use sed to perform search/replace. I usually do this from a bash shell script, and move the original file containing values to be substituted to a new name, and run sed writing the output to my original file name like this: #!/bin/bash mv myfile.txt myfile.txt.in sed -e ‘s/PatternToBeReplaced/Replacement/g’ myfile.txt.in > myfile.txt.
How to replace a pattern in a string in Bash?
You can repeat this for the other variables. Note that this depends on your data not having any spaces in it, since that’s the character used to separate fields in a bash array.