Sometimes you need an easy way to count number of lines in a text file. For example, how many lines in a .csv file. Easy: wc -l somefilename.csv You can also count number of characters in a file using “wc”: wc -m somefilename.txt Or number of words: wc -w somefilename.txt Explore the possiblities of “wc”: # wc –help Usage: wc…
Read More »This will validate most email address. if (ereg(“^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@+([_a-zA-Z0-9-]+\.)*[a-zA-Z0-9-]{2,200}\.[a-zA-Z]{2,6}$”, $email)) { echo ‘Email valid’; } else { echo ‘Email invalid; }
Read More »tar is a program which combine several files into one (eg: files.tar). gz or gzip is a program to compress files (eg: files.gz). Both are Linux programs. A tar.gz file is a resulting file from several files combined together and then compressed. To combine and compress a folder: tar czf filename.tar.gz /path/to/some/folder To extract a tar.gz file: tar -zxvf filename.tar.gz…
Read More »Your server logs killing you? Not anymore, here is a quick way to truncate the big log file to zero (make it empty). Command: cat /dev/null > [some_file] Example: cat /dev/null > /var/log/message This will truncate /var/log/message file.
Read More »PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham. Official PuTTY site is: http://www.chiark.greenend.org.uk/~sgtatham/putty/. PuTTY is an open source software and its free, licensed under MIT license. I’ve been using PuTTY for years, its easy to use. So far, only…
Read More »How to check validity of an URL. 1. Using Regex if (ereg(“^(http|https|ftp)\://[a-zA-Z0-9\.-]+\.[a-zA-Z0-9]{1,3}(:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\._\?\,\’/\\\+&%\$#\=~-])*$”, $url)) { echo ‘URL Correct’; } else { echo ‘Bad URL’; } This will validate URL with http, https and ftp schema. 2. Using fsockopen $url = parse_url($url); $conn = fsockopen($url[‘host’], 80); if (!$conn) die(‘Cannot connect!’); fwrite($conn, “GET {$url[‘path’]} HTTP/1.0\r\nHost: {$url[‘host’]}\r\nConnection: close\r\n\r\n”); $header = fgets($conn); if (preg_match(‘|HTTP/\S+\s+[2-3]\d\d|i’, $header))…
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