Awk to print each file

Question

I have about 50 files in a directory

Have

File1: 1|2|3

File2: 3|4|5

File3: A|B|C 

WANT

File1: A|1|2|3

File2: A|3|4|5

File3: A|A|B|C 

I'll appreciate if anyone can solve it with awk command. I'm open to other solutions in linux. Also, I want to run it once an perform edits on all files in a directory.

The solution (see below) I have will require me to run it on each file one at a time and I don't think that's efficient

awk '{print "A|"$0}' File1 

Answer 1

Try the below sed command,

sed -i 's/^/A|/' file1 file2 file3

To make it work on all the files in the current directory,

sed -i 's/^/A|/' *

Answer 2

使用GNU awk for -i inplace ：

gawk -i inplace '{print "A|"$0}' file1 file2 file3