for 2 digits, add 102, then remove the first 1 before displaying output. To number empty spaces the -ba (body numbering all) option can be used. If youre just after padding numbers with zeros to achieve fixed length, just add the nearest multiple of 10 eg. The NL command with the -bt (body number only non-empty lines) produces the same result. The NL command with no options will not number empty lines. file1īy default, the NL command uses the -v1 option, which starts the number at 1. 01 10 The str.zfill () function is exclusively designed to pad a string with zeros towards its left side. print(str(1).zfill(2)) print(str(10).zfill(2)) The code above provides the following output. Some other string can be used in place of TAB, such as a single period. The following code uses the str.zfill () function to display a number with leading zeros in Python. This can be viewed using the -sTAB (string tab) option. ~]# nl -w1 file1īy default, there are also 3 spaces between the number and the start of the line. The same can be accomplished using the -w1 (width 1) option. The -nln (format left justified) can be used to remove the 5 leading zeros. The NL command with the -nrl (format right justified & do not show leading zeros) is the equivelant of the NL command with no options. The 5 leading zero's can be viewed using the -nrz (format right justified & show leading zeros). ~]# cat -A file1īy default, the NL commands places 5 non-visible leading zeros before each line of text. The NL command uses the $ metacharacter to detect each line in the file. How does the NL command know where one line ends and the next begins? Using the cat command with the -A option, we can detect the end of a line with the $ metacharacter. Using shred to Zero Fill a Hard Drive in Linux The shred command on Linux is a specialist command that will securely erase your drive. This is very helpful when using the join command, as the JOIN command requires columns with identical values. The NL command without any options will number each line in the file. Example: For integer 42, you want to fill it up with leading zeros to the following string with 5 characters. How to convert it to a string by adding leading zeros so that the string has a fixed number of positions. Let's say there is a file file with a few lines of text. The str(i).zfill(5) accomplishes the same string conversion of an integer with leading zeros.
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