What Is S in Sed Command?

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-s makes bash read commands (the “install.sh” code as downloaded by “curl”) from stdin, and accept positional parameters nonetheless. — lets bash treat everything which follows as positional parameters instead of options.

What is S in shell script?

-S filename ] can be read as “not is-socket filename”. So the command is checking whether a “socket” (a special kind of file) exists with each name in the loop. The script uses this command as the argument to an if statement (which can take any command, not just [ ) and sets DOWN to true if any of them does not exist.

What does G mean in Linux?

g tells sed to “globally” substitute (change everything that matches the pattern on each line, rather than only the first on a given line). Three colons are used, because you need three delimiters. So :g is really two things: the last delimiter and the modifier “g”.

How do you call a variable in sed command?

3 Answers

1. Use double quotes so that the shell would expand variables.
2. Use a separator different than / since the replacement contains /
3. Escape the $ in the pattern since you don’t want to expand it.