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  1. #!/bin/bash
  2. s='NULL	NULL	NULL'
  3. sed -E ':a; s/(\t|^)NULL(\t|$)/\1\\N\2/g; ta' <<< "$s"
  4. sed -E ':a; s/(\t|^)NULL(\t|$)/\1\\N\2/g; ta' <<< "NULL"
Success #stdin #stdout 0s 4476KB
comments (?)
stdin 
Standard input is empty
stdout 
\N	\N	\N
\N
https://ideone.com/J972mV
language:
Bash (bash 5.0.3)
created:
5 years ago
visibility:
secret

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