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The example emphasizes many key characteristics of sed: Typical sed programs are rather short and simple. sed scripts can have comments (the line starting with the # symbol). The s (substitute) command is the most important sed command. sed allows simple programming, with commands such as q (quit).
An illustrative example of the complementary nature of parsing and templating is the s (substitute) command in the sed text processor, originating from search-and-replace in the ed text editor.
Process substitution can also be used to capture output that would normally go to a file, and redirect it to the input of a process. The Bash syntax for writing to a process is >(command). Here is an example using the tee, wc and gzip commands that counts the lines in a file with wc -l and compresses it with gzip in one pass:
Example usage of tee: The output of ls -l is redirected to tee which copies them to the file file.txt and to the pager less. The name tee comes from this scheme - it looks like the capital letter T. The tee command is normally used to split the output of a program so that it can be both displayed and saved in a file. The command can be used to ...
In computing, command substitution is a facility that allows a command to be run and its output to be pasted back on the command line as arguments to another command. Command substitution first appeared in the Bourne shell , [ 1 ] introduced with Version 7 Unix in 1979, and has remained a characteristic of all later Unix shells .
In some cases, such as sed and Perl, alternative delimiters can be used to avoid collision with contents, and to avoid having to escape occurrences of the delimiter character in the contents. For example, in sed the command s,/,X, will replace a / with an X, using commas as delimiters.
This template is used to create footnotes in Wikipedia, as an alternative and complement to the <ref> tag. Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status content 1 refn The content of the footnote. Content required name name The name of the footnote. Corresponds to the "name" attribute of the <ref> tag. String ...
This is an example using the actual Template:Like, and a hypothetical Template:Foo. You are attempting to include the Template:Foo, and indirectly the Template:Like, on a third page through transclusion and substitution. Template:Like displays this symbol: Like. For example, let's say the Template:Foo contained the wikitext {{Like}}.