Cat file1 into file2 after specific pattern match

cattext processing

I have file1 & file2, I want to cat file1 into file2 after match of 22 pattern.
Can I do it with cat or I need to go for awk or sed

file1

aa
bb
cc

file2

Resultant file2

11
22
aa
bb
cc
33
44

Best Answer

With sed:

sed -e '/22/r file1' file2

Related Solutions

Inserting a file into another file after the 1st occurrence of a pattern

sed '/PATTERN/{
       r file1
       :a
       n
       ba
     }' file2

:a, n, ba is just a cycle that printouts the whole file content after the PATTERN till the end. and note, that those 6 lines are just one command, but newline is needed to delimit the next sed command after r, : and b.

additional info from info sed :

`n'
     If auto-print is not disabled, print the pattern space, then,
     regardless, replace the pattern space with the next line of input.
     If there is no more input then `sed' exits without processing any
     more commands.

`: LABEL'
     [No addresses allowed.]

     Specify the location of LABEL for branch commands.  In all other
     respects, a no-op.

`b LABEL'
     Unconditionally branch to LABEL.  The LABEL may be omitted, in
     which case the next cycle is started.