Remove leading numbering from line
We had these log files that on most lines at the beginning there was a number followed by a dot and some times it had space characters.
sed command removes that prefix. and leaved intact the rest of the lines that do not have the prefix.
cat $log | sed '/^[0-9]*. */!d; s///;q';
Input: 123. Some text here. Output:Some text here.
Remove leading whitespace (space and tabs) from line:
sed script will remove all leading whitespace from each line by using a regular expression to match space characters and tabs.
cat $log | sed 's/^[ t]*//';
Input: Some text here. Output:Some text here.