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Top Forums UNIX for Dummies Questions & Answers Check the changes made to file in vi Post 302456150 by jlliagre on Thursday 23rd of September 2010 10:18:06 AM
Old 09-23-2010
To clarify, I wasn't suggesting to use any backup file that vi itself possibly creates by itself but to save the current buffer in a temporary file and compare it to the original one. This can be done simply with the two commands I already posted:
Code:
:w /tmp/current
:!diff -c /tmp/current % | less

(replace less by more if less is missing).
The backup files created by the traditional vi in /var/tmp aren't usable for that task as not being a plain copy of the current file but a structured binary designed to allow file recovery should the editor crashed (vi -r). This applies also to vim .swp files which aren't either editable text files.
 

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ZDIFF(1)						      General Commands Manual							  ZDIFF(1)

NAME
zcmp, zdiff - compare compressed files SYNOPSIS
zcmp [ cmp_options ] file1 [ file2 ] zdiff [ diff_options ] file1 [ file2 ] DESCRIPTION
Zcmp and zdiff are used to invoke the cmp or the diff program on files compressed via gzip. All options specified are passed directly to cmp or diff. If only one file is specified, then it is compared to a file with the same name without the .gz extension. If two files are specified, then they are uncompressed if necessary and fed to cmp or diff. The exit status from cmp or diff is preserved. When both files must be uncompressed before comparison, the second is uncompressed to /tmp. In all other cases, zdiff and zcmp use only a pipe. SEE ALSO
cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1), gzip(1), gzexe(1) BUGS
Messages from the cmp or diff programs refer to temporary filenames instead of those specified. ZDIFF(1)
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