diffmk - Marks differences between files
diffmk [-b] [-ab'mark'] [-ae'mark'] [-cb'mark']
[-ce'mark'] [-db'mark'] [-de'mark'] file1 file2
The diffmk command compares two versions of a file and
creates a new file that marks the differences.
Uses mark to mark where added lines begin. Uses mark to
mark where added lines end. Ignores differences that are
only changes in tabs or spaces on a line. Uses mark to
mark where changed lines begin. Uses mark to mark where
changed lines end. Uses mark to mark where deleted lines
begin. Uses mark to mark where deleted lines end.
The file1 and file2 variables are the old and new versions
of the file, respectively. The diffmk command compares
them and writes a new version to standard output, which
can be redirected to a file. This output contains the
lines of file2 marked with nroff change mark requests
(.mc), or with the marks you specify with the -ab, -ae,
-cb, -ce, -db, and -de options.
When output containing requests is formatted with nroff,
changed or inserted lines are marked by a | (vertical bar)
at the right margin of each line. An * (asterisk) indicates
that a line was deleted.
If the DIFFMARK environment variable is defined, it names
a command string that diffmk uses to compare the files.
(Normally, diffmk uses the diff command.) For example,
you might set DIFFMARK to diff -h in order to better handle
extremely large files.
To mark the differences between two versions of a text
file, enter: diffmk -ab'>I:' -ae'<I' -cb'>C' -ce'<C'
-db'>D' -de'<D' \
chap1.old chap1 >chap1.diffs
This causes diffmk to create a copy of chap1 called
chap1.diffs, showing differences between chap1.old
and chap1. Additions of one or more lines are
marked with >I and <I, changed lines are marked
with >C and <C, and deletions are marked with >D
and <D. To mark differences with nroff requests,
enter: diffmk chap1.old chap1 > chap1.nroff
This produces a copy of chap1 called chap1.nroff
containing nroff change mark requests to identify
text that was added to, changed, or deleted from
chap1.old. To use different nroff marking requests
and ignore changes in white space, enter: diffmk
-b -cb'.mc %' chap1.old chap1 > chap1.nroff
This imbeds commands that mark changes with % (percent
sign), additions with | (the default, because
no -a option is specified), and deletions with *
(the default). It does not mark changes that only
involve a different number of spaces or tabs
between words (-b).
Commands: diff(1), nroff(1)
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