07-08-2018
Expanding a little bit on what RudiC said in post #4 in this thread, shell variable expansions do not occur in single-quoted strings. What chandan.chaman suggested in post #5 would also work, but is more complicated than is needed.
Are backslash characters the only characters that are special in basic regular expressions that might appear in the text you want to replace? (Note that other BRE special characters include the period, opening square bracket (i.e., [), asterisk, circumflex, and dollar sign).
Are you creating the search pattern and replacement strings (so you can escape "special" characters)? Or, are they created by users invoking your script?
Does the pattern you want to replace in your file only occur once in your file? Or, can it appear on several lines in your file? Can it ever occur more than once on a single line in your file (and need to have every occurrence replaced)? If the pattern is to be treated as a literal string and doesn't need to be replaced more than once on any line, you might want to use awk's index() function to find your pattern and use substr() a couple of times to do the replacements instead of using sed's or ed's substitute command or awk's sub() or gsub() function to replace your text.
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LEARN ABOUT REDHAT
drop_user
DROP
USER(7) SQL Commands DROP USER(7)
NAME
DROP USER - remove a database user account
SYNOPSIS
DROP USER name
DESCRIPTION
DROP USER removes the specified user from the database. It does not remove tables, views, or other objects owned by the user. If the user
owns any database, an error is raised.
PARAMETERS
name The name of an existing user.
DIAGNOSTICS
DROP USER
The message returned if the user is successfully deleted.
ERROR: DROP USER: user "name" does not exist
This message occurs if the user name is not found.
DROP USER: user "name" owns database "name", cannot be removed
You must drop the database first or change its ownership.
NOTES
Use CREATE USER [create_user(7)] to add new users, and ALTER USER [alter_user(7)] to change a user's attributes. PostgreSQL includes a
program dropuser [dropuser(1)] that has the same functionality as this command (in fact, it calls this command) but can be run from the
command shell.
EXAMPLES
To drop a user account:
DROP USER jonathan;
COMPATIBILITY
The DROP USER statement is a PostgreSQL extension. The SQL standard leaves the definition of users to the implementation.
SEE ALSO
CREATE USER [create_user(7)], ALTER USER [alter_user(l)], dropuser(1)
SQL - Language Statements 2002-11-22 DROP USER(7)