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Advanced Bash−Scripting Guide by Mendel Cooper

By Mendel Cooper

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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Variable=\\\\ echo "$variable" # \\ # Second and fourth escapes escaped. k. Escaping a space can prevent word splitting in a command's argument list. Chapter 5. 7" # List of files as argument(s) to a command. # Add two files to the list, and list all. ls −l /usr/X11R6/bin/xsetroot /sbin/dump $file_list echo "−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−" # What happens if we escape a couple of spaces? ls −l /usr/X11R6/bin/xsetroot\ /sbin/dump\ $file_list # Error: the first three files concatenated into a single argument to 'ls −l' # because the two escaped spaces prevent argument (word) splitting.

O logical or exp1 −o exp2 returns true if either exp1 or exp2 are true. These are similar to the Bash comparison operators && and ||, used within double brackets. [[ condition1 && condition2 ]] The −o and −a operators work with the test command or occur within single test brackets. if [ "$exp1" −a "$exp2" ] Refer to Example 8−3, Example 26−16, and Example A−28 to see compound comparison operators in action. 4. Nested if/then Condition Tests Condition tests using the if/then construct may be nested.

An important use of quoting is protecting a command−line parameter from the shell, but still letting the calling program expand it. txt. txt. txt works under the Bash shell. [17] Quoting can also suppress echo's "appetite" for newlines. 1. Quoting Variables When referencing a variable, it is generally advisable to enclose its name in double quotes. This prevents reinterpretation of all special characters within the quoted string −− the variable name [18] −− except $, ` (backquote), and \ (escape).

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