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bash, Programming

IT Nursery

How to replace an entire line in a text file by line number

I have a situation where I want a bash script to replace an entire line in a file. The line number is always ...

June 4, 2022
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bash, Programming

IT Nursery

How to merge every two lines into one from the command line?

I have a text file with the following format. The first line is the “KEY” and the second line is the “VALUE”. KEY ...

June 3, 2022
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Programming, sed

IT Nursery

Insert a line at specific line number with sed or awk

I have a script file which I need to modify with another script to insert a text at the 8th line. String to ...

June 3, 2022
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linux, Programming

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How to use sed to remove the last n lines of a file

I want to remove some n lines from the end of a file. Can this be done using sed? For example, to remove ...

June 2, 2022
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Programming, regex

IT Nursery

How to replace a whole line with sed?

Suppose I have a file with lines aaa=bbb Now I would like to replace them with: aaa=xxx I can do that as follows: ...

June 2, 2022
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linux, Programming

IT Nursery

How to remove the lines which appear on file B from another file A?

I have a large file A (consisting of emails), one line for each mail. I also have another file B that contains another ...

June 1, 2022
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macos, Programming

IT Nursery

In-place edits with sed on OS X

I’d like edit a file with sed on OS X. I’m using the following command: sed 's/oldword/newword/' file.txt The output is sent to ...

May 31, 2022
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Programming, sed

IT Nursery

sed fails with “unknown option to `s'” error [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions about general computing hardware ...

May 29, 2022
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linux, Programming

IT Nursery

Appending a line to a file only if it does not already exist

I need to add the following line to the end of a config file: include "/configs/projectname.conf" to a file called lighttpd.conf I am ...

May 28, 2022
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RE error: illegal byte sequence on Mac OS X

I’m trying to replace a string in a Makefile on Mac OS X for cross-compiling to iOS. The string has embedded double quotes. ...

May 24, 2022
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