5 SC2020

Joachim Ansorg edited this page 2021-11-12 19:17:58 +01:00

Table of Contents

• tr replaces sets of chars, not words (mentioned due to duplicates).
• Problematic code:
• Correct code:
• Rationale:
• Exceptions

tr replaces sets of chars, not words (mentioned due to duplicates).

Problematic code:

echo 'hello world' | tr 'hello' 'goodbye'

Correct code:

echo 'hello world' | sed -e 's/hello/goodbye/g'

Rationale:

tr is for transliteration, turning some characters into other characters. It doesn't match strings or words, only individual characters.

In this case, it transliterates h->g, e->o, l->d, o->y, resulting in the string "goddb wbrdd" instead of "goodbye world".

The solution is to use a tool that does string search and replace, such as sed.

Exceptions

None.

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