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C programming Mandatory Find printable strings in files 2BSD strip: C programming Optional (SD) Remove unnecessary information from executable files Version 1 AT&T UNIX stty: Misc Mandatory Set the options for a terminal Version 2 AT&T UNIX tabs: Misc Mandatory Set terminal tabs PWB UNIX tail: Text processing Mandatory Copy the last part of a file
"foo" is not recognized as an internal or external command, operable program or batch file. Some early Unix shells produced the equally cryptic " foo: no such file or directory " again accurately describing what is wrong but confusing users.
Yes (via startup parameters and environment variables, DR-DOS also supports DIR /C /R user-default switch command) Yes (automatic \AUTOEXEC.BAT for primary shell, or explicitly via /P, /P:filename.bat or /K startup options) Yes (via CALL command or /C and /K startup options) No Yes OS/2 CMD.EXE: OS/2, eComStation, ArcaOS: CMD: 1987 No OS/2 ...
Prints a command to the terminal as Bash reads it. Bash reads constructs all at once, such as compound commands which include if-fi and case-esac blocks. If a set -v is included within a compound command, then "verbose" will be enabled the next time Bash reads code as input, ie, after the end of the currently executing construct. [108]
The Shellshock bug affects Bash, a program that various Unix-based systems use to execute command lines and command scripts. It is often installed as the system's default command-line interface. Analysis of the source code history of Bash shows the bug was introduced on 5 August 1989, and released in Bash version 1.03 on 1 September 1989. [14 ...
One example of this is Bash, which offers the same grammar and syntax as the Bourne shell, and which also provides a POSIX-compliant mode. [13] As such, most shell scripts written for the Bourne shell can be run in BASH, but the reverse may not be true since BASH has extensions which are not present in the Bourne shell.
tcsh added filename and command completion and command line editing concepts borrowed from the TENEX operating system, which is the source of the “t”. [7] Because it only added functionality and did not change what was there, tcsh remained backward compatible [ 8 ] with the original C shell.
Almquist shell (also known as A Shell, ash and sh) is a lightweight Unix shell originally written by Kenneth Almquist in the late 1980s. Initially a clone of the System V.4 variant of the Bourne shell, it replaced the original Bourne shell in the BSD versions of Unix released in the early 1990s.