Linux change filename batch

# method 1 (from the beggining of filename)
rename.ul filename_foo filename_bar *.png

# method 2 (replace some portion of filename)
for filename in *foo*; do echo mv \"$filename\" \"${filename//foo/bar}\"; done > rename.txt
# check commands then
for filename in *foo*; do echo mv \"$filename\" \"${filename//foo/bar}\"; done | /bin/bash

Source: makeuseof.com

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