By Mendel Cooper

ISBN-10: 1146068727

ISBN-13: 9781146068727

Данное руководство не предполагает наличие у читателя познаний в области программирования на языке сценариев, однако, быстро восполняет этот недостаток . . . постепенно, шаг за шагом раскрывая мудрость и красоту Unix(tm). Это руководство может рассматриваться как учебник, предназначенный для самостоятельного изучения или как справочник по программированию на shell. Руководство снабжено серией хорошо прокомментированных примеров, поскольку лучший путь к изучению языка сценариев -- это написание сценариев.

Кроме того, эта книга может служить в качестве учебного пособия по основам програмирования вообще.

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Additional info for Advanced Bash−Scripting Guide

Example text

Keywords (or commands) begin statements, and before a new statement on the same line begins, the old one must terminate. if [ −x "$filename" ]; then Else if and elif elif elif is a contraction for else if. The effect is to nest an inner if/then construct within an outer one. if [ condition1 ] then command1 command2 command3 elif [ condition2 ] # Same as else if then command4 command5 else default−command fi Chapter 7. Tests 46 Advanced Bash−Scripting Guide The if test condition−true construct is the exact equivalent of if [ condition−true ].

Special Variable Types local variables variables visible only within a code block or function (see also local variables in functions) environmental variables variables that affect the behavior of the shell and user interface In a more general context, each process has an "environment", that is, a group of variables that hold information that the process may reference. In this sense, the shell behaves like any other process. Every time a shell starts, it creates shell variables that correspond to its own environmental variables.

1 <−−− $2, $2 <−−− $3, $3 <−−− $4, etc. The old $1 disappears, but $0 (the script name) does not change. If you use a large number of positional parameters to a script, shift lets you access those past 10, although {bracket} notation also permits this. Example 4−7. /bin/bash # Using 'shift' to step through all the positional parameters. /shft a b c def 23 skidoo until [ −z "$1" ] do echo −n "$1 " shift done # Until all parameters used up... echo # Extra line feed. exit 0 The shift command works in a similar fashion on parameters passed to a function.

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