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Subject: |
How to show the diff command when there is a difference when comparing two files? |
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Date: |
Sat, 1 Feb 2014 13:27:55 -0600 |
Hi,
The following shows that diff -r print the command e.g. "diff -r
/var/folders/ft/9trh7jt57kqc_hyq0wm5rny40000gx/T/tmp.wcrIdLELps/b.txt
/var/folders/ft/9trh7jt57kqc_hyq0wm5rny40000gx/T/tmp.AJieJ9Zk1O/b.txt"
if there is an error. I'm wondering if I just compare two files, it is
possible to print the diff command if there is a difference between
the two files? Thanks.
~/linux/test/gnu/diffutils/diff/-r$ cat main.sh
#!/usr/bin/env bash
dir1=$(mktemp -d)
dir2=$(mktemp -d)
echo 'Hello World' > "$dir1/a.txt"
echo 'Hello World' > "$dir2/a.txt"
echo 'Hello World' > "$dir1/b.txt"
echo 'Hello World!' > "$dir2/b.txt"
#echo 'Hello World' > "$dir1/c.txt"
echo 'Hello World' | gzip -n > "$dir1/c.txt.gz"
diff -r "$dir1" "$dir2"
~/linux/test/gnu/diffutils/diff/-r$ ./main.sh
diff -r /var/folders/ft/9trh7jt57kqc_hyq0wm5rny40000gx/T/tmp.wcrIdLELps/b.txt
/var/folders/ft/9trh7jt57kqc_hyq0wm5rny40000gx/T/tmp.AJieJ9Zk1O/b.txt
1c1
< Hello World
---
> Hello World!
Only in /var/folders/ft/9trh7jt57kqc_hyq0wm5rny40000gx/T/tmp.wcrIdLELps:
c.txt.gz
--
Regards,
Peng
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--- Begin Message ---
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Subject: |
Re: How to show the diff command when there is a difference when comparing two files? |
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Date: |
Sat, 29 Mar 2014 22:22:40 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
I'm wondering if I just compare two files, it is
possible to print the diff command if there is a difference between
the two files?
Not in diff itself, but it's easy to do from a shell script. E.g.,
command="diff a b"
$command >output || {
echo "$command"
cat output
}
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