tr - Translate characters.
Translate, squeeze, and/or delete characters from standard input, writing to standard output.
Syntax
1
| tr [OPTIONS] SET1 [SET2]
|
Options
| Common Option |
Description |
| -c |
use the complement of SET1 |
| -d |
delete characters in the first set |
| -s |
replace each input sequence of a repeated character that is listed in SET1 with a single occurrence of that character |
| -t |
first truncate SET1 to length of SET2 |
Examples
Replace characters
Here we replace ‘a’ with ‘D’, ‘b’ with ‘E’ and ‘c’ with ‘F’.
Remove Characters
Remove character ‘a’ and ‘c’
Compress Characters
1
| tr -s '[:blank:]' < file1
|
Blanks will be compressed. e.g. ‘ab cd’ will become ‘ab cd’
Lower case to upper case
1
| tr '[:lower:]' '[:upper:]' < file1
|
Reference