There are 8 characters which filename can obtain
In earlier versions of MS DOS the maximum characters allowed in a filename was 8. Today, Windows will accept 255 characters for a filename.
1000
255
A filename in windows XP can have up to 255 characters.
Filename
12
26
25
In an MS-DOS filename, you may have up to 8 characters followed by a filename extension (eg. .txt, .doc, .bmp) with up to 3 characters separated by a period. In the filename, you may not use the following characters: < > . , : ; / | \ * ? + = " [ ] You may not use spaces either, and the only exception to using a period is separating the name with the extension. Foreign chararacters should be avoided due to codepage differences. Examples of valid filenames: snowcone.bmp report.txt stats.xls Examples of invalid filenames: snow cone.bmp one<two.txt statistics.xls
Enclose the filename in double quotes
This page website contains list of characters not allowed in a filename on windows, mac, Linux/unix http://www.comentum.com/File-Systems-HFS-FAT-UFS.HTML
The length of a file name is generally limited by the combination of OS and filesystem. Most common configurations: Windows XP/7 on NTFS has a max path+filename+ext (yes, full path and filename combined) length of 260. Path and folder take a minimum of 3 characters ("C:"), so you are left with effectively 257. Windows 98/95/3.x/DOS on FAT32 had max filename+ext length of 8+3. Most Linux/Unix filesystems have max filename+ext length of 255
Any old OS like MS-DOS. It supports a filename of 8 characters.
in linux wc -l filename will count the lines and wc will count the letters
You can change password as many times you want. The password must be minimum 8 characters of length. It must contain numerals and characters too.