How to use variables in a command in sed

Question

I have abc sh   exec  ROOT Subsystem xyz sh   On a Unix box  if I print echo  HOME then I get  HOME COM FILE   I want to replace  ROOT with  HOME using sed   Expected Output    exec  HOME COM FILE Subsystem xyz sh   I tried  but I m not getting the expected output   sed   s  ROOT    HOME   g  abc sh  gt  abc sh 1     Addition    If I have abc sh  exec  ROOT Subsystem xyz sh  ROOT ystem xyz1 sh   then with   sed  s   INSTALLROOT    INSTALLROOT    abc sh   it is only replacing first  ROOT  i e   output is coming as   exec  HOME COM FILE Subsystem xyz sh  ROOT ystem xyz1 sh

User · Accepted Answer

Say  sed  quot s   ROOT   HOME   quot  abc sh  Note   Use double quotes so that the shell would expand variables  Use a separator different than   since the replacement contains   Escape the   in the pattern since you don t want to expand it   EDIT  In order to replace all occurrences of  ROOT  say sed  quot s   ROOT   HOME  g quot  abc sh

User · Answer

This may also can help  input  inputtext  output  outputtext  sed  s  input   output    inputfile  gt  outputfile

User · Answer

This might work for you   sed  s  ROOT     HOME    g  abc sh  gt  abc sh 1

[unix] How to use variables in a command in sed?

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