There are couple of ways to make life easier with CVSdiff. But here is one that is really good.
First if you haven’t, install meld:
sudo yum install meld
meld is basically a diff viewer and pretty good at it 😉
Now open meld from the menu or from the terminal. And then select New. In the dialog box that appears select “Version Control Browser”. In the Directory box, browse to the folder where you have the code checked out and select ok. And you are all set.
Quick tip, you can use any expression for the sed commands in the (). With this trick you can redirect the stdout of 2 commands to the diff command. This might become very useful, if you want to compare 2 files, excluding the first line.
diff <(sed '1d' file) <(sed '1d' file2)
More interesting example is where the string ABC is converted to abc before comparing in the second file with the following command:
$ strace php tias.php -e open,access 2>&1 | grep foo.txt Sometimes a program refuses to read a file and you\’re not sure why. You may have display_errors turned off for PHP or something. In this example, fopen(\’/var/www/test/foo.txt\’) was called but doesn\’t have read access to foo.txt.
Strace can tell you what went wrong. E.g., if php doesn\’t have read access to the file, strace will say \”EACCESS (Permission denied)\”. Or, if the file path you gave doesn\’t exist, strace will say \”ENOENT (No such file or directory)\”, etc.
This works for any program you can run from the command-line, e.g., strace python myapp.py -e open,access…
Note: the above command uses php-cli, not mod_php, which is a different SAPI with diff configs, etc.