Download e-book for iPad: UNIX internals by S.D. Pate

By S.D. Pate

ISBN-10: 020187721X

ISBN-13: 9780201877212

Presents a transparent and distinctive description of the internals of the UNIX kernel, the interface among the person and the kernel, and the way the kernel interacts with the Intel X86 kin of CPUs. in keeping with the SCO models of the UNIX and SCO OpenServer unlock five, the textual content includes many useful examples.

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On the Exam Verify your understanding of the tilde (~) shortcut for the home directory. mv Syntax mv [options] source target Description Move or rename files and directories. For targets on the same filesystem (partition), moving a file doesn’t relocate the contents of the file itself. Rather, the directory entry for the target is updated with the new location. For targets on different filesystems, such a change can’t be made, so files are copied to the target location and the original sources are deleted.

The grep command would be last to execute, resulting in a complete data loss from the original file1 file because the file that replaced it was empty. To avoid this problem, simply use an intermediate file and then rename it: $ grep "stuff" file1 > file2 $ mv file2 file1 Standard input can also be redirected. The input redirection operator is <. Using a source other than the keyboard for a program’s input may seem odd at first, but since text programs don’t care about where their standard input streams originate, you can easily redirect input.

In unusual circumstances, such as on a terminal, using the meta key means pressing the Escape (Esc) key, releasing it, and then pressing the defined key. The Esc key is not a modifier, but serves to modify meta keys when an Alt-style key is unavailable. Work Effectively on the Unix Command Line 17 Study Guide 101 1. The exclamation point is often called bang on Linux and Unix systems. 12117 Page 18 Tuesday, October 9, 2001 1:46 PM Table 1-8: Basic Command History Editing Emacs Key Bindings (continued) Key C-l M-< M-> C-d C-k C-y M-d C-rtext C-stext Description Clear the screen, leaving the current line at the top of the screen Top of history Bottom of history Delete character from right Delete (kill) text from cursor to end of line Paste (yank) text previously cut (killed) Delete (kill) word Reverse search for text Forward search for text Command substitution bash offers a handy ability to do command substitution.

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UNIX internals by S.D. Pate

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