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Why does SED stop after the first match?
In the first line, only the second occurrence of “day” is changed. This is because sed stops after the first match per line. We have to add a “g” at the end of the expression, as shown below, to perform a global search so all matches in each line are processed: This matches three out of the four in the first line.
What does the comma mean in the sed command?
A single number selects that one line. Note the comma between 1 and 4. The p means “print matched lines.” By default, sed prints all lines. We’d see all the text in the file with the matching lines printed twice.
What does the p mean in the sed command?
The p means “print matched lines.” By default, sed prints all lines. We’d see all the text in the file with the matching lines printed twice. To prevent this, we’ll use the -n (quiet) option to suppress the unmatched text.
What is wrong with Linux-find and replace with SED?
But it doesn’t go through sub directories. What is wrong with this command? Here are some lines of output of find ./: Your find should look like that to avoid sending directory names to sed: Since there are also macOS folks reading this one (as I did), the following code worked for me (on 10.14)
How to make a global substitution in SED?
You should add the g modifier so that sed performs a global substitution of the contents of the pattern buffer: For a fantastic documentation on sed, check http://www.grymoire.com/Unix/Sed.html. This global flag is explained here: http://www.grymoire.com/Unix/Sed.html#uh-6
Are there any other tools similar to SED?
Another sophisticated tool similar to sed is gema, where you will match balanced curly braces very easily with {#}. So, depending on the tools you have at your disposal your “regular expression” (in a broader sense) may be able to match nested parenthesis.
When to use the-e option in SED?
The -E option enables extended regular expression syntax, alleviating the need to add backslashes before the parenthesis. See ERE syntax . When the doubled word span two lines the above regular expression will not find them as grep and sed operate line-by-line.