tr - transcribe
- tr
$ cat examples/intro/words.txt
foo
foo
bar
foo
bar
$ cat examples/intro/words.txt | tr 'f' 'x'
xoo
xoo
bar
xoo
bar
$ cat examples/intro/words.txt | tr '[a-z]' '[A-Z]'
FOO
FOO
BAR
FOO
BAR
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$ cat examples/intro/words.txt
foo
foo
bar
foo
bar
$ cat examples/intro/words.txt | tr 'f' 'x'
xoo
xoo
bar
xoo
bar
$ cat examples/intro/words.txt | tr '[a-z]' '[A-Z]'
FOO
FOO
BAR
FOO
BAR