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Is there a way to change multiple files with SED?
This way you don’t have to write complex loops, and it is simple to see, which files you are going to change, just run find before you run sed. Using a dictionary/hashMap (associative array) and variables for the sed command, we can loop through the array to replace several strings.
How to replace multiple patterns at once with SED?
Since there was a answer saying that sed is a stream editor and its replaces are greedily I think that I will need to use some script language for that. Replace ~ with a character that you know won’t be in the string. some text AB some more text “BC” and more text. some text BC some more text “CD” and more text.
How to replace a string with a SED?
Almost any character should work, but be careful with the characters that need escaping in your environment, sed, etc. depending on how you intend to use the results. If replacing the string by Variable, the solution doesn’t work. The sed command need to be in double quotes instead on single quote.
What does three newlines mean in SED syntax?
Three newlines means that a value is “locked-in”, like your original post way trying to do with ab and bc. After that point, further replacements will be undone, because they are protected by the newlines. A little complicated if I don’t say so myself… ! sed isn’t really meant for much more than the basics.
How can I use sed to replace a multi line string?
The hold space however is preserved. Finally, on the very last line, g restores the accumulation of every line from the hold space so that sed is able to run its regex on the whole input (rather than in a line-at-a-time fashion), and hence is able to match on s.
Why is my regex not working with SED?
In the simplest calling of sed, it has one line of text in the pattern space, ie. 1 line of n delimited text from the input. The single line in the pattern space has no n… That’s why your regex is not finding anything.
Which is the command for multi-line operations in SED?
sed has three commands to manage multi-line operations: N, D and P (compare them to normal n, d and p ). In this case, you can match the first line of your pattern, use N to append the second line to pattern space and then use s to do your substitution.
Do you have to run find before running SED?
It is quite simple: you have to pass it as an argument for sed like this: This way you don’t have to write complex loops, and it is simple to see, which files you are going to change, just run find before you run sed.
Can you use Grep and SED together on Mac?
You could use grep and sed together. This allows you to search subdirectories recursively. Those commands won’t work in the default sed that comes with Mac OS X. -i extension Edit files in-place, saving backups with the specified extension. If a zero-length extension is given, no backup will be saved.
How do you use unique markers in SED?
An unique marker (in this case ) is prepended to the start of the line and used as a method to bump-along the search throughout the length of the line. Once the marker reaches the end of the line the process is finished and is printed out the lookup table and markers being discarded.