task_boiler
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| task_boiler [2022/08/11 21:19] – raju | task_boiler [2024/01/23 22:55] (current) – raju | ||
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| Start the first heading with " | Start the first heading with " | ||
| - | ===== apply unix commands to all but the first line ===== | ||
| - | ==== Situation ==== | ||
| - | Let's say we want to sort a series of numbers in descending order but keep the header at the top. For example, given | ||
| - | < | ||
| - | $ echo -e " | ||
| - | value | ||
| - | 8 | ||
| - | 2 | ||
| - | 6 | ||
| - | 3 | ||
| - | </ | ||
| - | we want to output | ||
| - | < | ||
| - | value | ||
| - | 2 | ||
| - | 3 | ||
| - | 6 | ||
| - | 8 | ||
| - | </ | ||
| - | |||
| - | We can't directly use ' | ||
| - | < | ||
| - | $ echo -e " | ||
| - | 2 | ||
| - | 3 | ||
| - | 6 | ||
| - | 8 | ||
| - | value | ||
| - | </ | ||
| - | |||
| - | ==== simple solution ==== | ||
| - | Create a script called ' | ||
| - | < | ||
| - | # | ||
| - | # | ||
| - | # body: apply expression to all but the first line. | ||
| - | # Use multiple times in case the header spans more than one line. | ||
| - | # | ||
| - | # Example usage: | ||
| - | # $ echo -e " | ||
| - | # | ||
| - | IFS= read -r header | ||
| - | printf ' | ||
| - | " | ||
| - | </ | ||
| - | |||
| - | |||
| - | Give it exec | ||
task_boiler.1660252785.txt.gz · Last modified: 2022/08/11 21:19 by raju