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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=165527
@ -43,16 +43,10 @@
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.Nd display the last part of a file
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.Sh SYNOPSIS
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.Nm
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.Oo
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.Fl F |
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.Fl f |
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.Fl r
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.Oc
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.Op Fl F | f | r
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.Op Fl q
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.Oo
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.Fl b Ar number |
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.Fl c Ar number |
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.Fl n Ar number
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.Fl b Ar number | Fl c Ar number | Fl n Ar number
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.Oc
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.Op Ar
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.Sh DESCRIPTION
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@ -64,21 +58,25 @@ or, by default, its standard input, to the standard output.
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.Pp
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The display begins at a byte, line or 512-byte block location in the
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input.
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Numbers having a leading plus (``+'') sign are relative to the beginning
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Numbers having a leading plus
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.Pq Ql +
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sign are relative to the beginning
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of the input, for example,
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.Dq -c +2
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.Dq Li "-c +2"
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starts the display at the second
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byte of the input.
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Numbers having a leading minus (``-'') sign or no explicit sign are
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Numbers having a leading minus
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.Pq Ql -
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sign or no explicit sign are
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relative to the end of the input, for example,
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.Dq -n 2
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.Dq Li "-n 2"
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displays the last two lines of the input.
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The default starting location is
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.Dq -n 10 ,
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.Dq Li "-n 10" ,
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or the last 10 lines of the input.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.Bl -tag -width indent
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.It Fl b Ar number
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The location is
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.Ar number
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@ -122,8 +120,7 @@ The
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.Fl r
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option causes the input to be displayed in reverse order, by line.
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Additionally, this option changes the meaning of the
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.Fl b ,
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.Fl c
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.Fl b , c
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and
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.Fl n
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options.
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@ -139,9 +136,9 @@ option is to display all of the input.
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.Pp
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If more than a single file is specified, each file is preceded by a
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header consisting of the string
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.Dq ==> XXX <==
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.Dq Li "==> " Ns Ar XXX Ns Li " <=="
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where
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.Dq XXX
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.Ar XXX
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is the name of the file unless
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.Fl q
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flag is specified.
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@ -177,8 +174,11 @@ and
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.Fl n
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options modify the
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.Fl r
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option, i.e., ``-r -c 4'' displays the last 4 characters of the last line
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of the input, while the historic tail (using the historic syntax ``-4cr'')
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option, i.e.,
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.Dq Li "-r -c 4"
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displays the last 4 characters of the last line
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of the input, while the historic tail (using the historic syntax
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.Dq Li -4cr )
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would ignore the
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.Fl c
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option and display the last 4 lines of the input.
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