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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.
A system that is non-case-preserving is necessarily also case-insensitive. This applies, for example, to Identifiers (column and table names) in some relational databases (for example DB2, Interbase/Firebird, Oracle and Snowflake [1]), unless the identifier is specified within double quotation marks (in which case the identifier becomes case-sensitive).
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 choice of a variable name should be mnemonic — that is, designed to indicate to the casual observer the intent of its use. One-character variable names should be avoided except for temporary "throwaway" variables. Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters. int i;
Note that on case-sensitive platforms like Unix and with the gcc compiler the uppercase .C extension indicates a C++ source file. [31] Watcom C/C++, Borland C/C++, gcc and other C compilers C: Unix file archive COMPACT C++: C++ language source CPP: C++ language source Config Configuration file C32: COMBOOT Executable SYSLINUX: CAB [32] Cabinet ...
In POSIX namespace: any UTF-16 code unit (case-sensitive) except / as well as NUL [114] 32,767 characters with each path component (directory or filename) up to 255 characters long [ cf ] 16 TiB (17.59 TB) to 8 PiB (9.007 PB) [ cw ] [ 115 ]
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.
An INI file is a configuration file for computer software that consists of plain text with a structure and syntax comprising key–value pairs organized in sections. [1] The name of these configuration files comes from the filename extension INI, short for initialization, used in the MS-DOS operating system which popularized this method of software configuration.