There are no superscript letters in ASCII. ASCII contains only the basic Latin (English) letters A–Z, a–z, digits, and a small collection of other characters. There are only 128 code positions in ASCII. In Unicode, there are more characters (about 1,000,000 code positions, about which a little over 100,000 have currently been assigned). They include … Read more
What is the complete list of all special characters for a SQL (I’m interested in SQL Server but other’s would be good too) LIKE clause? E.g. SQL Server: % _ [specifier] E.g. [a-z] [^specifier] ESCAPE clause E.g. %30!%%’ ESCAPE ‘!’ will evaluate 30% as true ‘ characters need to be escaped with ‘ E.g. they’re … Read more
Tell grep to treat your input as fixed string using -F option. Option -n is required to get the line number,
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
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 it) and the safelist in this example is digits, word … Read more
You should use the string replace function, with a single regex. Assuming by special characters, you mean anything that’s not letter, here is a solution:
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: From the manual: (acessible by calling man bash in your shell) $? Expands to the exit status of the most recently executed foreground pipeline. By convention an exit status of 0 means success, and non-zero return status … 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. sed command: sed -e “s/’/’\\\\”/g; 1s/^/’/; \$s/\$/’/” 2. … Read more