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How to change variable value inside text file with SED?
Change variable value inside text file with Sed Ask Question Asked7 years, 4 months ago Active2 months ago Viewed17k times 2 3 I have a text file containting this Var1=ofzer Var2=smelf .. .. VarN=mskfm I want to change the value of one of my variables using Sed. How is that possible? bashshellsed Share
How to change variable value inside text file?
You’ll need to use a regular expression as an addressto find the line to change. Then use the “s” commandto change the value. Use the -ioption to edit the file in-place. Here’s the GNU sed manual– glenn jackmanMar 6 ’14 at 15:59
How to replace a pattern in Bash using SED?
$ {parameter/pattern/string} — replace the first match of pattern with string. $ {parameter//pattern/string} — replace all matches of pattern with string. website=$ {website // / / \\\\/} ^ ^ ^ ^ | | | | | | | string, ‘\\’ needs to be backslashed | | delimiter | pattern replace globally
Why is my SED failing in regex Linux?
Since $ {old_line} contains many regex special metacharacters like *, ? etc therefore your sed is failing. Not the answer you’re looking for? Browse other questions tagged regex linux bash sed or ask your own question.
How to isolate a value in a SED file?
Using sed with a regular expression (-r) and suppressing the printing of the pattern space (-n), we can pull out specific values: The regular expression essentially says to consider any character except the newline as part of the value, and since it is in parentheses as a capture group, we then refer to it as “\\1” to isolate it.
How to comment out values in a properties file?
The regular expression essentially says to consider any character except the newline as part of the value, and since it is in parentheses as a capture group, we then refer to it as “\\1” to isolate it. Often, a properties file will have commented out values that start with a hash mark (#).