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e.g hostname = "test.test.test", then after removing result should be like "testtesttest"
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The tr command (short for translate) is used to translate, squeeze, and delete characters from a string. You can also use tr to remove characters from a string. For demonstration purposes, we will use a sample string and then pipe it to the tr command.
The commandline is interpreted by the shell, using the first \ to escape the second one, so one \ is passed literally to grep. The dot . is not special to the shell, so it is passed verbatim anyway. Grep then reads the (single) \ and uses it to escape the dot . .
In Bash (and ksh, zsh, dash, etc.), you can use parameter expansion with % which will remove characters from the end of the string or # which will remove characters from the beginning of the string. If you use a single one of those characters, the smallest matching string will be removed.
Here are all the ways in which variables are substituted in Shell: ${variable} This command substitutes the value of the variable. ${variable:-word} If a variable is null or if it is not set, word is substituted for variable.
$ foo=test.test.test $ echo "${foo//./}" testtesttest You can also pipe into
tr -d '.' But the best way of doing this is not to use an external command and use shell built in.
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