There are couple of ways to make life easier with CVS diff. 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 😉
Continue readingQuick 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:
Continue reading$ strace php tias.php -e open,access 2>&1 | <a class="zem_slink freebase/en/grep" href="http://en.wikipedia.org/wiki/Grep" title="Grep" rel="wikipedia">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 <a class="zem_slink freebase/en/php" href="http://www.php.net/" title="PHP" rel="homepage">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 <a class="zem_slink freebase/guid/9202a8c04000641f8000000000220ffa" href="http://en.wikipedia.org/wiki/Path_%28computing%29" title="Path (computing)" rel="wikipedia">file path you gave doesn’t exist, strace will say ”ENOENT (No such file or directory)”, etc.
Continue readingIn Linux you can use diff command to find the differences in file.
What is interesting is that you can use ”diff -u” to list the differences with ’+’ and ’-’ rather than sometimes confusing ’>’ and '<’.
Running the regular diff between two text files to see the differences is not so elegant for the human eye to decode. Luckily there are plenty of tools out there to make this easy.
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