Find and replace filename recursively in a directory

Question

I want to rename all the files in a folder which starts with 123_xxx.txt to xxx.txt.

For example, my directory has:

123_xxx         


        

Answer 1

you could check 'rename' tool

for example

rename 's/^123_//' *.txt

or (gawk is needed)

find . -name '123_*.txt'|awk '{print "mv "$0" "gensub(/\/123_(.*\.txt)$/,"/\\1","g");}'|sh

test:

kent$  tree
.
|-- 123_a.txt
|-- 123_b.txt
|-- 123_c.txt
|-- 123_d.txt
|-- 123_e.txt
`-- u
    |-- 123_a.txt
    |-- 123_b.txt
    |-- 123_c.txt
    |-- 123_d.txt
    `-- 123_e.txt

1 directory, 10 files

kent$  find . -name '123_*.txt'|awk '{print "mv "$0" "gensub(/\/123_(.*\.txt)$/,"/\\1","g");}'|sh

kent$  tree
.
|-- a.txt
|-- b.txt
|-- c.txt
|-- d.txt
|-- e.txt
`-- u
    |-- a.txt
    |-- b.txt
    |-- c.txt
    |-- d.txt
    `-- e.txt

1 directory, 10 files