UNIX Shells by Example (4th Edition)
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validation program values, null, checking for variables [See also local variables, environment variables ] $? variable arithmetic attributes Korn shell awk 2nd 3rd Bash 2nd BASH_ENV variable built-in awk 2nd C shell C shell 2nd debugging issues 2nd directory stack environment Bourne shell Korn shell exit status Bourne shell C shell using in script extracting values from Bash Bourne shell C shell Korn shell field history Bash C shell initialization integers Bash 2nd Korn shell 2nd Korn shell 2nd local Bourne shell C shell Korn shell local variables nawk user -defined functions null or unset pathname modifiers printing Bourne shell echo command 2nd Korn shell TC shell set Bourne shell Korn shell special Bourne shell C shell Korn shell substitution types unsetting Bourne shell Korn shell user-defined variable expansion modifiers Bourne shell Korn shell verbose option vi Bash commands Korn shell TC shell Korn shell regular expression metacharacters selecting as editor TC shell vi editor text editors FCEDIT variable
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