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| ### find | |
| find . -name "pattern" | |
| -E regular expression | |
| find / \! -user ccUser | |
| ### cut | |
| cut | |
| -d : delimiter | |
| -f : field | |
| -c : character position | |
| """ | |
| echo 'foo,bar,qaz,baz' | cut -d , -f 2-3 | |
| # bar qaz | |
| """ | |
| ### tr | |
| tr [from_string] [to_string] | |
| -d : delete | |
| -C,-c : set of characters in string | |
| -s : squeeze, ignore space | |
| ### join | |
| join [f1] [f2] | |
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