How to add to the end of lines containing a pattern with sed or awk

Question

Here is example file   somestuff    all  thing otherthing some other stuff   What I want to do is to add to the line that starts with all  like this   somestuff    all  thing otherthing anotherthing some other stuff

User · Answer

You can append the text to  0 in awk if it matches the condition   awk    all     0  0  anotherthing   1  file   Explanation    patt        if the line matches the pattern given by patt  then perform the actions described within     In this case    all     0  0  anotherthing   if the line starts  represented by    with all   then append anotherthing to the line  1 as a true condition  triggers the default action of awk  print the current line  print  0   This will happen always  so it will either print the original line or the modified one    Test  For your given input it returns   somestuff    all  thing otherthing anotherthing some other stuff   Note you could also provide the text to append in a variable     awk -v mytext   EXTRA TEXT     all     0  0mytext  1  file somestuff    all  thing otherthing EXTRA TEXT some other stuff

User · Answer

This should work for you  sed -e  s  all      amp  anotherthing     Using s command  substitute  you can search for a line which satisfies a regular expression  In the command above   amp  stands for the matched string

User · Answer

This works for me  sed    all   s    anotherthing   file   The first part is a pattern to find and the second part is an ordinary sed s substitution using   for the end of a line   If you want to change the file during the process  use -i option  sed -i    all   s    anotherthing   file   Or you can redirect it to another file  sed    all   s    anotherthing   file  gt  output

User · Answer

Here is another simple solution using sed      sed -i  s all    amp  anotherthing g  filename txt   Explanation    all   means all lines started with  all     amp  represent the match  ie the complete line that starts with  all    then sed replace the former with the later and appends the   anotherthing  word

User · Answer

Solution with awk   awk   if   1     all   print  0   anotherthing   else print  0   file   Simply  if the row starts with all print the row plus  anotherthing   else print just the row

User · Answer

In bash   while read -r line   do         line    all       amp  amp  line    anotherthing      echo   line  done  lt  filename

[bash] How to add to the end of lines containing a pattern with sed or awk?

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