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Constants

Usually indicates that the command was not found by the shell, or that the command is found but that a library it requires is not found.
Command was found but is not executable by the shell.
Usually indicates that the command was not found by the shell, or that the command is found but that a library it requires is not found.
The SIGABRT signal is sent to a process by its controlling terminal when process abort signal
The SIGALRM signal is sent to a process when the time limit specified in a call to a preceding alarm setting function (such as setitimer) elapses.
The SIGFPE signal is sent to a process by its controlling terminal when there is an erroneous arithmetic operation
The SIGHUP signal is sent to a process when its controlling terminal is closed.
The SIGILL signal is sent to a process by its controlling terminal when an illegal instruction is encountered
The SIGINT signal is sent to a process by its controlling terminal when a user wishes to interrupt the process.
The SIGKILL signal is sent to a process to cause it to terminate immediately. In contrast to SIGTERM and SIGINT, this signal cannot be caught or ignored, and the receiving process cannot perform any clean-up upon receiving this signal.
The SIGPIPE signal is sent to a process when it attempts to write to a pipe without a process connected to the other end.
The SIGQUIT signal is sent to a process by its controlling terminal when a user quit from keyboard (Ctrl-. or, Ctrl-4 or, on the virtual console, the SysRq key)
The SIGSEGV signal is sent to a process on invalid memory reference
The SIGTERM signal is sent to a process to request its termination. Unlike the SIGKILL signal, it can be caught and interpreted or ignored by the process.
The SIGTRAP signal is sent to a process by its controlling terminal when there is a trace/breakpoint trap
Exit status out of range
Command line usage error

Functions