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5 >Shells</TITLE
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36 >The tcshrc manual: A guide for the tcshrc package</TH
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43 ><A
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66 CLASS="CHAPTER"
67 ><H1
68 ><A
69 NAME="AEN45"
70 >Shells</A
71 ></H1
72 ><P
73 >The shell is an interface to the operating system just like the graphic user interface
74 (<SPAN
75 CLASS="ACRONYM"
76 >GUI</SPAN
77 >) is.
78 Typically, the shell acts as a command interpreter;
79 it takes each command and passes it to the operating system. It then
80 displays the results of this operation on your screen.</P
81 ><P
82 >The most common shells are
83 <P
84 ></P
85 ><UL
86 ><LI
87 ><P
88 > Bourne shell (sh)
89 </P
90 ></LI
91 ><LI
92 ><P
93 > C shell (csh)
94 </P
95 ></LI
96 ><LI
97 ><P
98 > Korn shell (ksh)
99 </P
100 ></LI
101 ><LI
102 ><P
103 > TC Shell (tcsh)
104 </P
105 ></LI
106 ><LI
107 ><P
108 > Bourne Again Shell (bash)
109 </P
110 ></LI
111 ></UL
112 ></P
113 ><P
114 >To identify which shell you are currently running, you may type
115 in your current shell
116 <TT
117 CLASS="USERINPUT"
118 ><B
119 >echo $shell</B
120 ></TT
121 ></P
122 ><P
123 >Historically, the shell came before the GUI, however the latter has become more popular
124 since it allows in several cases easier usage of a computer. In reality, the shell
125 is well-suited in specific types of usage and extra functionality that it may provide
126 can make it quite productive.</P
127 ><P
128 >This document describes the tcshrc project, a project that demonstrates exactly this
129 extra functionality of the tcsh shell and makes it more accesible to the end user.</P
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