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SED    
Stream editor.

The {Unix} stream editor. It has a powerful but cryptic
command language and is based on {regular expressions}.

There is a {GNU} version called {GNU Sed}.

[{Jargon File}]

(1994-11-03)

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  • How to match whitespace in sed? - Super User
    How can I match whitespace in sed? In my data I want to match all of 3+ subsequent whitespace characters (tab space) and replace them by 2 spaces How can this be done?
  • How to match digits followed by a dot using sed? - Super User
    The sed man page references the re_format man page It makes 2 distinctions: (1) obsolete versus extended regular expressions; (2) non-enhanced versus enhanced regular expressions All 4 combinations are possible There is support in sed for both obsolete and extended, but in either case only for non-enhanced The \d operator is a feature of enhanced regular expressions, therefore not
  • linux - sed -r vs. sed - exactly how are the regex possibilities . . .
    In bash, as I understand it, I can use characters like ^ * in regular expressions with sed, but the -r option changes the nature of how regular expressions are, uh, expressed, kinda like grep vs grep -E
  • bash - How to use sed with piping - Super User
    For all reasonably modern GNU sed, however, -E is an undocumented synonym for -r The rumor is that POSIX has settled on -E, which BSD OSX already uses, and, if that is added to the final standard, we will all be transitioning to -E
  • sed: How to replace variable line if found or append to end of file if . . .
    Sed moves through the document line by line, taking the line that follows below it and moving it above the line we're inserting Since sed works like a "pipe", being a stream editor, it will do this until it reaches the end of the document and stops processing changes And the last of it is the file to be modified: home pi Public test txt
  • bash - Modifying a file with sed using redirection - Super User
    1 Question: Modifying a file with sed using redirection Answer: obviously, the -i switch was added to sed for a reason Just using redirection leaves you looking at a somewhat convoluted solution
  • sed - Ubuntu command line to replace replace single quotes ( ) with . . .
    You don't really need to quote the sed parameter, provided there are no blanks or characters which the shell will expand: both sed s \" \' g and the author's original string are neater
  • Woking on block of text with sed while changed delimiter
    The ' 'es in your _file variable confuse sed as it uses the ' ' as a delimiter for the addresses as well as the substitute delimitors You need to change the delimiter (e g to | ) whereby the first delimiter of each address must be escaped (like this \|) :
  • use of alternation | in seds regex - Super User
    In the GnuWin32 on Windows sed the syntax is sed "s thing1\|thing2 g" source > destination The quotes must of type " - this is "Required" for the command to be parsed
  • What does this sed command mean? - Super User
    The sed command that I posted is in a autotools configure ac script that was written for MacOS, and I was executing that script on Linux, and Linux sed is confused by a space between '-i' and the backup file replacement





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