Bourne shell Assignment Help

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The Bourne shell, or sh, was the default Unix shell of Unix Version 7 and most Unix-like systems continue to have /bin/sh - which will be the Bourne shell, or a symbolic link or hard link to a compatible shell - even when more modern shells are used by most users. Developed by Stephen Bourne at AT&T Bell Laboratories, it was a replacement for the Thompson shell, whose executable file had the same name, sh. It was released in 1977 in the Version 7 Unix release distributed to colleges and universities. Although it is used as an interactive command interpreter, it was always intended as a scripting language and contains all the features that are commonly considered to produce structured programs.

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Features of sh programming language:

Scripts can be invoked by using their filename
interactively or non-interactively
execution of commands allow both synchronous and asynchronous
redirection and pipelines input and output are supported
a set of built-in commands are provided
Quotation facilities, flow control constructs, and functions are provided.
Type less variables
local and global variable scope are supported
Compilation before execution for script is not required
Code restructuring may be necessary
Command substitution uses back quotes: &apso;command&apso;.
Here documents using < to embed a block of input text within a script.

Bourne shell Program

{`
#!/bin/sh
for P in "$@"; do
IFS=:
for D in $PATH; do
for F in $D/$P; do
[ -x "$F" ] && echo $F
done
done
`}