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In this example, /usr/bin/env is the full path of the env command. The environment is not altered. Note that it is possible to specify the interpreter without using env, by giving the full path of the python interpreter. A problem with that approach is that on different computer systems, the exact path may be different.
pkg-config is software development tool that queries information about libraries from a local, file-based database for the purpose of building a codebase that depends on them. . It allows for sharing a codebase in a cross-platform way by using host-specific library information that is stored outside of yet referenced by the codeba
When a command is entered in a command shell or a system call is made by a program to execute a program, the system first searches the current working directory and then searches the path, examining each directory from left to right, looking for an executable filename that matches the command name given. Executable programs have filename ...
path. The argument specifies the path name of the file to execute as the new process image. Arguments beginning at arg0 are pointers to arguments to be passed to the new process image. The argv value is an array of pointers to arguments. arg0. The first argument arg0 should be the name of the executable file. Usually it is the same value as the ...
An ELF file has two views: the program header shows the segments used at run time, whereas the section header lists the set of sections. In computing, the Executable and Linkable Format [2] (ELF, formerly named Extensible Linking Format) is a common standard file format for executable files, object code, shared libraries, and core dumps.
Name Description arch: Prints machine hardware name (same as uname -m) basename: Removes the path prefix from a given pathname chroot: Changes the root directory date: Prints or sets the system date and time dirname: Strips non-directory suffix from file name du: Shows disk usage on file systems echo: Displays a specified line of text env
For example, consider a script having the initial line #!/bin/sh -x. It may be invoked simply by giving its file path, such as some/path/to/foo, [12] and some parameters, such as bar and baz: some/path/to/foo bar baz In this case /bin/sh is invoked in its place, with parameters -x, some/path/to/foo, bar, and baz, as if the original command had been
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.