I want to replace the lines matching a pattern from one file from the lines in order from another file, for example, given:
file1.txt:
aaaaaa
bbbbbb
!! 1234
!! 4567
ccccc
ddddd
!! 1111
we like to replace the lines starting with !! with the lines of this file:
file2.txt:
first line
second line
third line
so the result should be:
aaaaaa
bbbbbb
first line
second line
ccccc
ddddd
third line
Easy can be done with awk
awk '
/^!!/{ #for line stared with `!!`
getline <"file2.txt" #read 1 line from outer file into $0
}
1 #alias for `print $0`
' file1.txt
Other version
awk '
NR == FNR{ #for lines in first file
S[NR] = $0 #put line in array `S` with row number as index
next #starts script from the beginning
}
/^!!/{ #for line stared with `!!`
$0=S[++count] #replace line by corresponded array element
}
1 #alias for `print $0`
' file2.txt file1.txt
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