| --- Log opened Mon Feb 26 00:00:22 2018 |
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| 14:28 | < simon_> | I'm trying to create a rotated log with bash: |
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| 14:30 | < simon_> | readLog log.txt | sed -n '1!p' | ... | writeLog log.txt how do I add $line at the end of the piped log content? I've just removed the first line using sed, but adding a line to the pipe, I'm not sure how to. |
| 14:31 | < simon_> | I'm trying to avoid using a variable. |
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| 14:37 | < simon_> | (readLog log.txt | sed -n '1!p'; echo "new latest line") | writeLog log.txt doesn't seem to work. |
| 14:41 | <&ToxicFrog> | I would expect it to; how does it fail? |
| 14:42 | <&ToxicFrog> | You could also use '$ a' in sed to append a line at the end. |
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| 14:45 | < simon_> | ToxicFrog, well, instead of turning "1\n2\n3" into "2\n3\n4", it just has "4" because it starts writing before reading has finished. |
| 14:46 | < simon_> | s/(?<=\d)"/\n"/g |
| 14:48 | <&ToxicFrog> | How do you mean? |
| 14:49 | <&ToxicFrog> | Like, AIUI your goal is to delete the first line and add a new last line, right? |
| 14:49 | < simon_> | (cat foo.txt | sed -n '1!p'; echo 4) | cat - > bar.txt # this actually seems to work. |
| 14:49 | < simon_> | yes. |
| 14:49 | <&ToxicFrog> | So why not just: |
| 14:49 | <&ToxicFrog> | sed -E -i ' |
| 14:49 | <&ToxicFrog> | 1 d |
| 14:49 | <&ToxicFrog> | $ a\ |
| 14:49 | <&ToxicFrog> | new line goes here' log.txt |
| 14:49 | < simon_> | nice! I'll go with that. :) |
| 14:50 | < simon_> | I've never really learned to use sed. always stuck to perl for these one-liner things. |
| 14:50 | <&ToxicFrog> | (d is "delete line", a is "append harcoded text", $ is "the last line of the input") |
| 14:51 | < simon_> | and is there any way for 'new line goes here' to accidentally be interpreted as a series of sed commands? |
| 15:02 | < simon_> | that is, I've got my line in a sh variable. |
| 15:26 | <&ToxicFrog> | simon_: is there any chance it has embedded newlines? |
| 15:26 | <&ToxicFrog> | If not, you're good; the format of a is 'a' '\\' '\n' <text to insert> '\n' |
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| 16:52 | < simon_> | thanks, ToxicFrog. |
| 16:53 | <&ToxicFrog> | My biggest beef with the a, i, and c commands is that there's no way to do them on a single line. |
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| --- Log closed Tue Feb 27 00:00:24 2018 |