How to replace a whole line with sed

Question

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   sed  s aaa bbb aaa xxx g   Now I have a file with a few lines as follows   aaa bbb aaa ccc aaa ddd aaa  something else    How can I replace all this lines aaa  something  with aaa xxx using sed

User · Accepted Answer

Try this   sed  s aaa    aaa xxx g

User · Answer

Like this   sed  s aaa    aaa xxx     If you want to guarantee that the aaa  is at the start of the line  make it   sed  s  aaa    aaa xxx

User · Answer

This might work for you   cat  lt  lt     sed   aaa   bbb  ccc  ddd    s   aaa       1xxx    gt  aaa bbb  gt  aaa ccc  gt  aaa ddd  gt  aaa  something else    aaa bbb aaa ccc aaa ddd aaa xxx

User · Answer

sed -i bak  s   aaa       1 xxx  g  your file

User · Answer

If you would like to use awk then this would work too   awk -F     2  xxx  print   OFS      filename

User · Answer

You can also use sed s change line to accomplish this   sed -i   aaa  c aaa xxx  your file here   This will go through and find any lines that pass the aaa  test  which means that the line contains the letters aaa    Then it replaces the entire line with aaa xxx   You can add a   at the beginning of the test to make sure you only get the lines that start with aaa  but that s up to you

[regex] How to replace a whole line with sed?

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