Advanced Bash-Scripting Guide. A complete guide to shell by Cooper M.

By Cooper M.

The complex Bash Scripting consultant is either a reference and an academic on shell scripting. This complete ebook (the similar of approximately 646 print pages) covers virtually each element of shell scripting. It comprises over three hundred profusely commented illustrative examples, and a few tables. not only a shell scripting educational, this booklet additionally offers an creation to easy programming innovations, corresponding to sorting and recursion. it really is like minded for both person examine or school room use.

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Example text

Fi echo echo "Testing \"−n \$xyz\"" if [ −n "$xyz" ] # More pedantically correct. " fi echo xyz= Chapter 7. Tests # Initialized, but set to null value. " fi echo # When is "false" true? echo "Testing \"false\"" if [ "false" ] # It seems that "false" is just a string. " #+ and it tests true. " fi echo echo "Testing \"\$false\"" # Again, uninitialized variable. " fi # Now, we get the expected result. echo exit 0 Exercise. Explain the behavior of Example 7−1, above. if [ condition−true ] then command 1 command 2 ...

This example courtesy of Stephane Chazelas. Escaping is a method of quoting single characters. The escape (\) preceding a character tells the shell to interpret that character literally. With certain commands and utilities, such as echo and sed, escaping a character may have the opposite effect − it can toggle on a special meaning for that character. Special meanings of certain escaped characters used with echo and sed \n means newline Chapter 6. Quoting 32 Advanced Bash−Scripting Guide \r means return \t means tab \v means vertical tab \b means backspace \a means "alert" (beep or flash) \0xx translates to the octal ASCII equivalent of 0xx Example 6−2.

15] This is useful for executables (such as pppd and cdrecord) that need to access system hardware. Lacking the suid flag, these binaries could not be invoked by a non−root user. 2. File test operators 43 Advanced Bash−Scripting Guide −rwsr−xr−t 1 root 178236 Oct 2 2000 /usr/sbin/pppd A file with the suid flag set shows an s in its permissions. −k sticky bit set Commonly known as the "sticky bit", the save−text−mode flag is a special type of file permission. If a file has this flag set, that file will be kept in cache memory, for quicker access.

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