How to rename part of a filename and replace the string in those files

If we want to rename only certain part of the filename, for example, we want to change a filename “memory_map.c” to “memory_mapping.c” i.e. we just want to rename “map” to “mapping” of the file, we  can use following command,

$ ls -al memory_map.c
-rw-rw-r– 1 user user 642 Aug 19 22:53 memory_map.c
:~/Desktop$ rename ‘s/map/mapping/’ memory_map.c

:~/Desktop$ ls -al memory_mapping.c
-rw-rw-r– 1 user user 642 Aug 19 22:53 memory_mapping.c

So, using above command, we change only part of filename from “map” to “mapping”. Now, we can just replace filename with “*.c” or “*” to rename all the files in the particular directory.

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Now, if we want to change some string like function name in the same file or number of other files, we can use sed to do this in a single command as,

$ grep -rl somestring memory_mapping.c | xargs sed -i ‘s/somestring/string2/g’

for changing “somestring” from multiple files, use command,

$ grep -rl somestring “/directory” | xargs sed -i ‘s/somestring/string2/g’

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