Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION Instrukcja Użytkownika Pobierz pdf (Strona 273)

17.4 Identifying and Working with File Types 261

17.4.3 System Files

.rpm – a Red Hat Package Manager ﬁle

.conf – aconﬁguration ﬁle

.a – an archive ﬁle

.lock – a “lock”ﬁle; determines whether a program is in use

17.4.4 Programming and Scripting Files

.h – a C and C++ program language header ﬁle

.c – a C program language source code ﬁle

.cpp – a C++ program language source code ﬁle

.o – aprogramobjectﬁle

.pl – aPerlscript

.tcl – aTCLscript

.so – a library ﬁle

But ﬁle extensions are not always used, or used consistently. So what happens when a ﬁle doesn’t

have an extension, or the ﬁle doesn’t seem to be what the extension says it’s supposed to be?

That’s when the file command can come in handy.

In 16 on page 217, we created a ﬁle called saturday – without an extension. Using the file com-

mand, we can tell what the ﬁle is by typing:

file saturday

and we’ll see it’satextﬁle. Any ﬁle that’s designated a text ﬁle should be readable using cat, more,

or less.

Tip: To learn more about the file command, read the file man page by typing man

file.

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