Note how the script is parameterized using shell variables and proper quoting. Either of these expressions will match all of the characters in a non-empty string, but only. Finally, as a GNU sed extension, you can include a special sequence made of a backslash and one of the letters L , l , U , u , or E. This GNU extension of sed matches every step lines starting with line first. Note that sed counts lines continuously across all input files unless -i or -s options are specified. Matches everywhere but on a word boundary; that is it matches if the character to the left and the character to the right are either both "word" characters or both "non-word" characters.
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