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33 lines
1.5 KiB
Plaintext
33 lines
1.5 KiB
Plaintext
# printf
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# Format and print data
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# This command is typically available as a built-in to many shells, such as the
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# Bourne shell and the Bourne Again Shell. However, there also exists a GNU
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# alternative, sometimes found over at `/usr/bin/printf`.
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# Assign the current date (timestamp style) as a shell variable, using the Bash
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# builtin, and make it a suitable filename for a Gzip-compressed Tar archive.
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printf -v FileName 'Backup_%(%F_%X)T.tgz' -1
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# Simple, feature-full, and portable way by which to echo(1) output to STDOUT.
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# Here, the current user's username is displayed, followed by a new line.
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printf '%s\n' "$USER"
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# Using the Bash builtin, this will output one integer per line, from one to
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# one million, in a human-readable kind of way, by appropriately
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# comma-separating the units.
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printf "%'d\n" {1..1000000}
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# Getting these results by using the comma is actually also viable in AWK, but
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# you'll likely have to jump through a quotation hoop to get access to it.
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# Zero-pad a number in order to maintain a width of 3 characters. It's also
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# possible to instead provide a `0` in-place of the hash (`#`).
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printf '%#.3d\n' 12
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# As above, but instead, space-pad the number. Prefix the `3` with a hyphen
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# (`-`) to left-align the number, causing the padding to occur on the right.
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printf '%3d\n' 12
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# Set a field's spacing by using an integer provided as a variable. This is
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# incredibly useful when you're dealing with inconsistent field lengths.
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printf '%*s\n' $Integer 'Example Field'
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