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--- unix_survival [2020/04/08 23:09]
joshd
+++ unix_survival [2020/04/08 23:16] (current)
joshd
@@ Line 152: / Line 152: @@
 ** Shell Programming **
-The shell itself is programmable via /shell scripts/.  As with C, a complete tutorial is beyond the scope of this page but we'll provide a few examples to get you started.  The below examples are for // /bin/sh//, the //Bourne shell//, as this is available on all online UNIX systems.  Other common shells are //ksh, csh, tcsh, and bash//.
+The shell itself is programmable via /shell scripts/.  A shell script can invoke any of the standard UNIX tools as well as other shell scripts, and can make use of control constructs, including loops and comparisons.  As with C, a complete tutorial is beyond the scope of this page but we'll provide a few examples to get you started.  The below examples are for // /bin/sh//, the //Bourne shell//, as this is available on all online UNIX systems.  Other common shells are //ksh, csh, tcsh, and bash//.
 As with the C examples above, we'll use //ed// to create our source files.  (Short shell scripting can also be done interactively at the command line.)
@@ Line 168: / Line 168: @@
 </code>
-The first line (//#!/bin/sh) is sometimes referred to as the "shebang" line (because UNIX programmers are weird) and tells the operating system what shell to invoke to execute the script file.
+The first line (//#!/bin/sh//) is sometimes referred to as the "shebang" line (because UNIX programmers are weird) and tells the operating system what shell to invoke to execute the script file -- in this case the Bourne shell, in /bin/sh.
 Now we've created the script, and there it is on disk:

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