Using SED with wildcard
The asterisk (*) means “zero or more of the previous item”. If you want to match any single character use If you want to match any string (i.e. any single character zero or more times) use
sed
sed command with -i option failing on Mac, but works on Linux
If you use the -i option you need to provide an extension for your backups. If you have: The command (note the lack of space between -i and ” and the -e to make it work on new versions of Mac and on GNU): Create 2 backup files like: There is no portable way to avoid making backup files because it is impossible … Read more
RE error: illegal byte sequence on Mac OS X
A sample command that exhibits the symptom: sed ‘s/./@/’ <<<$’\xfc’ fails, because byte 0xfc is not a valid UTF-8 char.Note that, by contrast, GNU sed (Linux, but also installable on macOS) simply passes the invalid byte through, without reporting an error. Using the formerly accepted answer is an option if you don’t mind losing support for your true locale (if you’re on a US system … Read more
the ‘d’ command in the sed utility
It means that sed will read the next line and start processing it. Your test script doesn’t do what you think. It matches the empty lines and applies the delete command to them. They don’t appear, so the print statements don’t get applied to the empty lines. The two print commands aren’t connected to the … Read more
How to replace a whole line with sed?
Try this:
How can I replace a newline (\n) using sed?
Use this solution with GNU sed: This will read the whole file in a loop (‘:a;N;$!ba), then replaces the newline(s) with a space (s/\n/ /g). Additional substitutions can be simply appended if needed. Explanation: sed starts by reading the first line excluding the newline into the pattern space. Create a label via :a. Append a newline and next … Read more
How to remove the quotes when reading a variable in jq in shell?
Given a JSON file, arguments.json: When calling reading the variables as such: [out]: The variable contains the quotation marks “”. How to remove the quotes when reading a variable in jq? I could use sed to strip the quotes as such: [out]:
How can I output only captured groups with sed?
The key to getting this to work is to tell sed to exclude what you don’t want to be output as well as specifying what you do want. This says: don’t default to printing each line (-n) exclude zero or more non-digits include one or more digits exclude one or more non-digits include one or more digits … Read more
How to remove double-quotes in jq output for parsing json files in bash?
Use the -r (or –raw-output) option to emit raw strings as output:
“sed” command in bash
sed is the Stream EDitor. It can do a whole pile of really cool things, but the most common is text replacement. The s,%,$,g part of the command line is the sed command to execute. The s stands for substitute, the , characters are delimiters (other characters can be used; /, : and @ are popular). The % is the pattern to match (here a literal percent sign) and the $ is the second pattern … Read more