In linux, you have a file called test.txt, how do you replace only the first occurence of "GNU", on each line in that file, with "NGU"? You can have this output just go to prompt/stdout (no need to capture it in new file).
Answer
sed -e 's/GNU/NGU/' test.txt
^^ note the -e is needed (e for expression)
^^ note that the last / in the 's/regex/replace/' is not followed by anything, i.e. not followed by g, to indicate replacing only the first instance found, not all instances
Question
In linux, you have a file called test.txt, how do you replace only the first occurence of "GNU", on each line in that file, with "NGU"? You can have this output just go to prompt/stdout (no need to capture it in new file).
Answer
?
Question
In linux, you have a file called test.txt, how do you replace only the first occurence of "GNU", on each line in that file, with "NGU"? You can have this output just go to prompt/stdout (no need to capture it in new file).
Answer
sed -e 's/GNU/NGU/' test.txt
^^ note the -e is needed (e for expression)
^^ note that the last / in the 's/regex/replace/' is not followed by anything, i.e. not followed by g, to indicate replacing only the first instance found, not all instances
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8. Streams and sed -- The Stream Editor \ > <resultfile> where <search-regexp> is a regular expression, <replace-text> is the text you would like to replace each occurrence with, and <option> is nothing or <span>g , which means to replace every occurrence in the same line (usually sed just replaces the first occurrence of the regular expression in each line). (There are other <option> ; see
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