Vertical tab was used to speed up printer vertical movement. Some printers used special tab belts with various tab spots. This helped align content on forms. VT to header space, fill in header, VT to body area, fill in lines, VT to form footer. Generally it was coded in the program as a character constant. … Read more
This is the exit status of the last executed command. For example the command true always returns a status of 0 and false always returns a status of 1: true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to … Read more
There are two easy and safe rules which work not only in sh but also bash. 1. Put the whole string in single quotes This works for all chars except single quote itself. To escape the single quote, close the quoting before it, insert the single quote, and re-open the quoting. ‘I’\”m a s@fe $tring … Read more
They’re different characters. \r is carriage return, and \n is line feed. On “old” printers, \r sent the print head back to the start of the line, and \n advanced the paper by one line. Both were therefore necessary to start printing on the next line. Obviously that’s somewhat irrelevant now, although depending on the … Read more
var desired = stringToReplace.replace(/[^\w\s]/gi, ”) As was mentioned in the comments it’s easier to do this as a whitelist – replace the characters which aren’t in your safelist. The caret (^) character is the negation of the set […], gi say global and case-insensitive (the latter is a bit redundant but I wanted to mention … Read more
Encode it: &