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File names: Traditionally, Unix-like operating systems treat file names case-sensitively while Microsoft Windows is case-insensitive but, for most file systems, case-preserving. For more details, see below. Variable names: Some programming languages are case-sensitive for their variable names while others are not. For more details, see below.
However, not all file systems on those systems are case-sensitive; by default, HFS+ and APFS in macOS are case-insensitive but case-preserving, and SMB servers usually provide case-insensitive behavior (even when the underlying file system is case-sensitive, e.g. Samba on most Unix-like systems), and SMB client file systems provide case ...
The lowercase "a" and uppercase "A" are the two case variants of the first letter in the English alphabet. In file systems, case preservation is the preservation of the letter case (uppercase or lowercase) of letters in file names. If an attempt is made to create a file named "ThisIsAFile" on a file system that preserves letter case, the file's ...
Wikipedia file names should be clear and descriptive, ... Like other wiki page names, file names are case sensitive except for the first character, which will always ...
The command interpreter preserves the case of whatever parameters are passed to commands, but the command names themselves and file names are case-insensitive. Many commands are the same across many DOS systems, but some differ in command syntax or name.
Some computer systems allow file names to contain spaces; others do not. Case-sensitivity of file names is determined by the file system. Unix file systems are usually case sensitive and allow user-level applications to create files whose names differ only in the case of characters.
It is conventional for environment-variable names to be chosen to be in all upper cases. In programming code generally, this helps to distinguish environment variables from other kinds of names in the code. Environment-variable names are case sensitive on Unix-like operating systems but not on DOS, OS/2, and Windows.
Most file systems restrict the length of a file name. Some file systems match file names as case sensitive and others as case insensitive. For example, the names MYFILE and myfile match the same file for case insensitive, but different files for case sensitive. Most modern file systems allow a file name to contain a wide range of characters ...