====== WORKING WITH TEXT IN LINUX ======

===== TR =====

''tr'' (translate) is a stream filter that operates on single characters, not patterns or words. It reads stdin and writes stdout, transforming one character at a time.

== SQUEEZE ==

Squeeze (-s) collapse repeats:
<code bash>
tr -s ' '              # multiple spaces → single space
tr -s '\n'             # collapse blank lines
tr -s ' ' ','          # squeeze spaces AND translate to comma (combined)
</code>