Programming

New PDF release: Advanced Bash−Scripting Guide

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 resources for Advanced Bash−Scripting Guide

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Illegal division by 0. # 1 # What effect does the "2>/dev/null" have? # What would happen if it were removed? # Try removing it, then rerunning the script. 2. File test operators Returns true if... −e file exists −a file exists This is identical in effect to −e. It has been "deprecated," and its use is discouraged. ) −c Chapter 7. ) −p file is a pipe −h file is a symbolic link −L file is a symbolic link −S file is a socket −t file (descriptor) is associated with a terminal device This test option may be used to check whether the stdin ([ −t 0 ]) or stdout ([ −t 1 ]) in a given script is a terminal.

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 ]. As it happens, the left bracket, [ , is a token which invokes the test command. The closing right bracket, ] , in an if/test should not therefore be strictly necessary, however newer versions of Bash require it.

Introduction to Variables and Parameters 30 Advanced Bash−Scripting Guide $0 is the name of the script itself, $1 is the first argument, $2 the second, $3 the third, and so forth. [16] After $9, the arguments must be enclosed in brackets, for example, ${10}, ${11}, ${12}. The special variables $* and $@ denote all the positional parameters. Example 4−5. " # Strips out path name info (see 'basename') echo if [ −n "$1" ] then echo "Parameter #1 is $1" fi # Tested variable is quoted. # Need quotes to escape # if [ −n "$2" ] then echo "Parameter #2 is $2" fi if [ −n "$3" ] then echo "Parameter #3 is $3" fi # ...

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Advanced Bash−Scripting Guide by Mendel Cooper


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