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wait normally returns the exit status of the last job which terminated. It may also return 127 in the event that n specifies a non-existent job or zero if there were no jobs to wait for. Because wait needs to be aware of the job table of the current shell execution environment, it is usually implemented as a shell builtin .
A commercial example would be the 1988 Norton Utilities Batch Enhancer (BE) command, where BE DELAY 18 would wait for 1 second, or the free 94-byte WAIT.COM [11] where WAIT 5 would wait for 5 seconds, then return control to the script. Most such programs are 16-bit .COM files, so are incompatible with 64-bit Windows.
It was inherited into the first version of POSIX and the Single Unix Specification. [1] It first appeared in Version 4 Unix. [2] The version of sleep bundled in GNU coreutils was written by Jim Meyering and Paul Eggert. [3] The command is also available in the OS-9 shell, [4] in the KolibriOS Shell, [5] and part of the FreeDOS Package group ...
Thread 0: Will be sleeping for 3 seconds. Thread 1: Started. Thread 1: Will be sleeping for 5 seconds. Thread 2: Will be sleeping for 4 seconds. Thread 4: Started. Thread 4: Will be sleeping for 1 seconds. In main: All threads are created. Thread 3: Will be sleeping for 4 seconds. Thread 4: Ended. Thread 0: Ended. In main: Thread 0 has ended ...
Bash can execute the vast majority of Bourne shell scripts without modification, with the exception of Bourne shell scripts stumbling into fringe syntax behavior interpreted differently in Bash or attempting to run a system command matching a newer Bash builtin, etc. Bash command syntax includes ideas drawn from the Korn Shell (ksh) and the C ...
On Unix-like and other POSIX operating systems, the sleep() function is called providing a single parameter of type unsigned integer of the number of seconds to sleep. [3] A higher-precision version is the nanosleep() function and the now deprecated usleep. [4] POSIX also allows for choosing clock sources via the extended version clock ...
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Expect is an extension to the Tcl scripting language written by Don Libes. [2] The program automates interactions with programs that expose a text terminal interface. Expect, originally written in 1990 for the Unix platform, has since become available for Microsoft Windows and other systems.