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I'm trying to print the following pattern using printf and seq:
0000
0001
0002
0003
My problem is once I use:
seq 0 10 | xargs printf %04d
all my output is formatted into the same line likeso:
0000000100020003
I still can't get the hang of using xargs. How do I use it correctly in this case?
454
Redirecting and piping the output By default, printf will send the outputs to stdout (terminal). You can redirect the output to a file using the redirection operator or combine it with the pipe operator for further processing.
2.3. 1 C standard output (printf(), puts() and putchar()) The printf() function sends a formatted string to the standard output (the display). This string can display formatted variables and special control characters, such as new lines ('\n'), backspaces ('\b') and tabspaces ('\t'); these are listed in Table 2.1.
“printf” command in Linux is used to display the given string, number or any other format specifier on the terminal window. It works the same way as “printf” works in programming languages like C. Note: printf can have format specifiers, escape sequences or ordinary characters.
The printf command does not output a line break if you don't ask it to. Try:
seq 0 10 | xargs printf '%04d\n'
Note that you can achieve the same with just seq, since it allows specifying a printf-style format:
seq -f %04g 0 10
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