If you’re worried about starting two sed processes in a pipeline for performance reasons, you probably shouldn’t be, it’s still very efficient. But based on your comment that you want to do in-place editing, you can still do that with distinct commands (sed commands rather than invocations of sed itself). You can either use multiple … Read more
This is based on potong’s answer. The following code replaces ‘ll’ with ‘zz’, creates a backup file, displays the new text, and writes the change(s) into the file. $ echo hello > test $ sed -e ‘s/ll/zz/;w /dev/stdout’ -i .backup test hezzo $ cat test hezzo $ cat test.backup hello
Your question is a little confusing since there’s no me in the original string to replace. However, I think I have it. Let me paraphrase: I have a sed command which can successfully replace a single quote ‘ with the word me. I want a similar one which can replace it with the character sequence … Read more
This thread is another example of how to over complicate things. This should do it: sed ‘0~30 s/$/string/g’ < inputfile > outputfile Every 30 lines “string” is inserted at the end of the line. If you want a new line with the word “string” just use “\n string”.
sed -i ‘s#{test1}#test2#’ /example/myfile.txt You don’t need escape {}
For anyone who found this question due to a similar error message, but caused by an attempt to in-place edit on Mac OS X As per https://github.com/lmquang/til/issues/18: OS X requires the extension to be explicitly specified. The workaround is to set an empty string: $ sed -i ” ‘s/megatron/pony/g’ /path/to/file.txt ^^ man sed: -i extension … Read more
The delimiters // that you’re using are not for the d command, they’re for the addressing. I think you’re comparing them to the slashes in the s/// command… However although both relate to regular expressions, they are different contexts. The address (which appears before the command) filters which lines the command is applied to… The … Read more
Here’s a simple example: $ echo ‘abcabcabc’ | sed ‘s/\(ab\)c/\1/’ ababcabc $ echo ‘abcabcabc’ | sed ‘s/\(ab\)c/\1/g’ ababab $ echo ‘abcabcabc’ | sed ‘s/\(ab\)\(c\)/\1d\2/g’ abdcabdcabdc In the first command, only the first match is affected. In the second command, every match is affected. In both cases, the \1 refers to the characters captured by the … Read more
Use tr: tr -d ‘^M’ < inputfile (Note that the ^M character can be input using Ctrl+VCtrl+M) EDIT: As suggested by Glenn Jackman, if you’re using bash, you could also say: tr -d $’\r’ < inputfile
Give this a try: sed ‘/^$/N;/^\n$/D’ inputfile Explanation: /^$/N – match an empty line and append it to pattern space. ; – command delimiter, allows multiple commands on one line, can be used instead of separating commands into multiple -e clauses for versions of sed that support it. /^\n$/D – if the pattern space contains … Read more