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My requirement is like this, in my folder i have lot of files
i have to find the biggest file. my folder contains lots of sub folders also......
i think i gave a clear picture about my requirment...
You could have given us some info about which Linux distro you are using, and also how big is your hard drive, etc.
If you are using the KDE desktop, then open the Start menu and click on Home to open the File Manager. Then click on the Size tab at the top of the second column twice, and a little black arrow should appear pointing up. This will sort directories and files with the biggest at the top. Now you just have to go through all the directories and sub-directories by hand.
You could view the directory using a GUI file manager like konqueror under KDE, nautilus under Gnome, Thunar under XFCE, select detailed listing and then sort on the size and look at the top/bottom of the list.
The same approach works for the ls program in the terminal - sort and take the top or bottom of the list.
From the ls manual page:
-S sort by file size
What it doesn't say explicitly is that the list will be in descending order, so you can take the top of the list to see the largest (I just found it by trying it and seeing what order it was using).
This will just print the name of the largest file:
ls -S |head -1
Or if you want to see the details, add an l (lower case L):