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Update comparison with sed

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Mention the `-E` flag for `sed`, but with some caveats, to make the comparison more fair. Split out the delimiter quoting from the slash quoting examples, and pick an example that's more favorable for `sd`. Add a simple example just comparing the noisier syntax of `s///g` vs two arguments. Add an example of the danger of `sed -i` in cross-platform usage.
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Brian Campbell 2018-12-26 19:42:58 -05:00 committed by GitHub
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@ -23,16 +23,26 @@ Find & replace expressions are split up, which makes them easy to read and write
While sed does a whole lot more, `sd` focuses on doing just one thing and doing it well.
Some cherry-picked examples, where `sd` shines:
- Simpler syntax for replacing all occurrences:
- sd: `sd before after`
- sed: `sed s/before/after/g`
- Replace newlines with commas:
- sd: `sd '\r' ','`
- sed: `sed ':a;N;$!ba;s/\r/,/g'`
- Extracting stuff out of strings with special characters
- sd: `echo "{((sample with /path/))}" | sd '\{\(\(.*(/.*/)\)\)\}' '$1'`
- sed
- incorrect, but closest I could get after 15 minutes of struggle
- `echo "{((sample with /path/))}" | sed 's/{((\.\*\(\/.*\/\)))}/\1/g'`
Note: although `sed` does have a nicer regex syntax with `-r`, it is a non-portable GNU-ism and thus doesn't work on MacOS, BSD, or Solaris.
- sed: `sed ':a;N;$!ba;s/\r/,/g'`, or use a different tool like `tr`.
- Familiar regex syntax by default:
- sd: `echo "start middle end" | sd 'start (.+) end' '$1'`
- sed: basic REs have an unfamiliar and limited syntax, `-E` for more familiar syntax of extended regular expressions is widely supported but not available on some platforms like Solaris:
- `echo "start middle end" | sed 's/start \(..*\) end/\1/g'`
- `echo "start middle end" | sed -E 's/start (.+) end/\1/g'`
- Extracting stuff out of strings containing slashes:
- sd: `echo "sample with /path/" | sd '.*(/.*/)' '$1'`
- sed: you need to know that the delimiters for `s` can be replaced with other arbitrary characters
- `echo "sample with /path/" | sed -E 's|.*(/.*/)|\1|g'`
- In place modification of files:
- sd: `sd before after -i file.txt`
- sed: you need to be careful to use `-e` or else some platforms will consider the next argument to be a backup suffix
- `sed -i -e 's/before/after/g' file.txt`
## Installation