Date: Tue, 17 Mar 2020 10:02:59 +0000 (UTC) From: Mateusz Piotrowski <0mp@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r359032 - head/usr.bin/units Message-ID: <202003171002.02HA2xOY041550@repo.freebsd.org>
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Author: 0mp (doc,ports committer) Date: Tue Mar 17 10:02:59 2020 New Revision: 359032 URL: https://svnweb.freebsd.org/changeset/base/359032 Log: Tell the world how to convert gigabytes to bytes with units(1) easily It turns out that units(1) is not as horrible to use in scripts as I initially thought. When the --terse flag is combined with an appropriate output format (set via --output-format), units(1) is actually capable of producing very nice results. For example: units -o %0.f -t '4 gigabytes' bytes is is just going to print out the expected value of 4294967296. There is no time to waste. People have to know about it. I am adding an example for this at the top of the examples section because this is what users are most likely looking for. Approved by: bcr (mentor) Differential Revision: https://reviews.freebsd.org/D24096 Modified: head/usr.bin/units/units.1 Modified: head/usr.bin/units/units.1 ============================================================================== --- head/usr.bin/units/units.1 Tue Mar 17 09:12:47 2020 (r359031) +++ head/usr.bin/units/units.1 Tue Mar 17 10:02:59 2020 (r359032) @@ -1,5 +1,5 @@ .\" $FreeBSD$ -.Dd February 3, 2020 +.Dd March 17, 2020 .Dt UNITS 1 .Os .Sh NAME @@ -232,8 +232,21 @@ The standard units file. .Ex -std .Sh EXAMPLES .Bl -tag -width 0n -.It Sy Example 1 : No Interactive usage +.It Sy Example 1 : No Simple conversion of units .Pp +This example shows how to do simple conversions, for example from gigabytes +to bytes: +.Bd -literal -offset 2n +.Li $ Ic units -o %0.f -t '4 gigabytes' bytes +4294967296 +.Ed +.Pp +The +.Fl o Cm %0.f +part of the command is required to print the result in a non-scientific +notation (e.g, 4294967296 instead of 4.29497e+09). +.It Sy Example 2 : No Interactive usage +.Pp Here is an example of an interactive session where the user is prompted for units: .Bd -literal -offset 2n @@ -261,7 +274,7 @@ units: .Li You want : Ic degC 29.444444 .Ed -.It Sy Example 2 : No Difference between Do Ic \&| Dc No and Do Ic / Dc No division +.It Sy Example 3 : No Difference between Do Ic \&| Dc No and Do Ic / Dc No division .Pp The following command shows how to convert half a meter to centimeters. .Bd -literal -offset 2n @@ -293,7 +306,7 @@ as .Dq Ic 0.5/meter , which is not conformable to .Dq Ic cm . -.It Sy Example 3 : No Simple units file +.It Sy Example 4 : No Simple units file Here is an example of a short units file that defines some basic units: .Pp @@ -307,7 +320,7 @@ units: .It "ft 12 inches" .It "mile 5280 ft" .El -.It Sy Example 4 : No Viewing units and conversions of the default units file +.It Sy Example 5 : No Viewing units and conversions of the default units file The following shell one-liner allows the user to view the contents of the default units file: .Bd -literal -offset 2n
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