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

By Cooper M.

The complicated Bash Scripting consultant is either a reference and an academic on shell scripting. This entire ebook (the similar of approximately 646 print pages) covers virtually each element of shell scripting. It includes over three hundred profusely commented illustrative examples, and a couple of tables. not only a shell scripting instructional, this publication additionally offers an creation to easy programming options, akin to sorting and recursion. it truly is like minded for both person research or lecture room use.

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Chapter 6. Quoting 34 Advanced Bash−Scripting Guide Escaping a space can prevent word splitting in a command's argument list. 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.

Bin/bash #View gzipped files with 'most' NOARGS=65 NOTFOUND=66 NOTGZIP=67 if [ $# −eq 0 ] # same effect as: if [ −z "$1" ] # $1 can exist, but be empty: zmost "" arg2 arg3 then echo "Usage: `basename $0` filename" >&2 # Error message to stderr. exit $NOARGS # Returns 65 as exit status of script (error code). fi filename=$1 if [ ! −f "$filename" ] # Quoting $filename allows for possible spaces. " >&2 # Error message to stderr. 3. = "gz" ] # Using bracket in variable substitution. " exit $NOTGZIP fi zcat $1 | most # Uses the file viewer 'most' (similar to 'less').

3" # Error. 3") echo "b = $b" # b=1 Use bc in scripts that that need floating point calculations or math library functions. bitwise operators. The bitwise operators seldom make an appearance in shell scripts. Their chief use seems to be manipulating and testing values read from ports or sockets. "Bit flipping" is more relevant to compiled languages, such as C and C++, which run fast enough to permit its use on the fly. bitwise operators << Chapter 8. Operations and Related Topics 54 Advanced Bash−Scripting Guide bitwise left shift (multiplies by 2 for each shift position) <<= "left−shift−equal" let "var <<= 2" results in var left−shifted 2 bits (multiplied by 4) >> bitwise right shift (divides by 2 for each shift position) >>= "right−shift−equal" (inverse of <<=) & bitwise and &= "bitwise and−equal" | bitwise OR |= "bitwise OR−equal" ~ bitwise negate !

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