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#!/usr/bin/env python3 – Execute with a Python interpreter, using the env program search path to find it #!/bin/false – Do nothing, but return a non-zero exit status , indicating failure. Used to prevent stand-alone execution of a script file intended for execution in a specific context, such as by the . command from sh/bash, source from ...
Modulefile for Environment Modules [91] 4D 53 57 49 4D 00 00 00 D0 00 00 00 00: MSWIM␀␀␀Ð␀␀␀␀ 0 wim swm esd Windows Imaging Format file 21 2D 31 53 4C 4F 42 1F!-1SLOB␟ 0 slob Slob (sorted list of blobs) is a read-only, compressed data store with dictionary-like interface [92] AC ED: ¬í: 0 Serialized Java Data [93]
Shell is the de facto language for writing cdist configuration scripts, but most of the scripts can be written in any language if they contain a suitable shebang line. Shell scripting is favored because of how simple it is to access environment variables, read files, and execute system commands.
The Unix "shebang" – #! – used on the first line of a script to point to the interpreter to be used. "Magic comments" identifying the encoding a source file is using, [21] e.g. Python's PEP 263. [22] The script below for a Unix-like system shows both of these uses:
env is a shell command for Unix and Unix-like operating systems. It is used to either print a list of environment variables or run another utility in an altered environment without having to modify the currently existing environment. Using env, variables may be added or removed, and existing variables may be changed by assigning new values to them.
The bug involved how Bash passed function definitions to subshells through environment variables. [75] The bug had been present in the source code since August 1989 (version 1.03) [76] and was patched in September 2014 (version 4.3). Patches to fix the bugs were made available soon after the bugs were identified.
On old Unix, Shebang is not compatible with BOM. Nowadays, text files are generally written in UTF-8, and often with BOM. This makes some files, those with both BOM and shebang not to work on old Unix. But scripts with both BOM and shebang can still be launched indicating the interpreter to use on the command line. So my question:
Alternatively, from command shells such as bash, a user can change environment variables for a particular command invocation by indirectly invoking it via env or using the ENVIRONMENT_VARIABLE=VALUE <command> notation. A running program can access the values of environment variables for configuration purposes.