By Mendel Cooper
This is often the full reference at the Borne back shell (bash). quantity 1Volume 2 comprises all appendices.
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Additional resources for Advanced Bash-Scripting Guide
Let "num = (( 200 | 11 ))" echo $num let "num = (( 200 | 11 ))" echo $? # Bitwise OR # 0 *** # 203 # 0 *** # The "let" construct returns the same exit status #+ as the double-parentheses arithmetic expansion. Chapter 7. Tests 48 Advanced Bash-Scripting Guide • An if can test any command, not just conditions enclosed within brackets. if cmp a b &> /dev/null # Suppress output. " fi word=Linux letter_sequence=inu if echo "$word" | grep -q "$letter_sequence" # The "-q" option to grep suppresses output.
0 *** # ... let "num = (( 200 || 11 ))" echo $num # 1 let "num = (( 200 || 11 ))" echo $? # 0 *** # Logical OR (( 200 | 11 )) echo $? # ... let "num = (( 200 | 11 ))" echo $num let "num = (( 200 | 11 ))" echo $? # Bitwise OR # 0 *** # 203 # 0 *** # The "let" construct returns the same exit status #+ as the double-parentheses arithmetic expansion. Chapter 7. Tests 48 Advanced Bash-Scripting Guide • An if can test any command, not just conditions enclosed within brackets. if cmp a b &> /dev/null # Suppress output.
Example 7-3. /bin/bash # Arithmetic tests. # The (( ... )) construct evaluates and tests numerical expressions. # Exit status opposite from [ ... ] construct! Chapter 7. k. " # Division result < 1. # Rounded off to 0. " # 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. # ======================================= # # (( ... )) also useful in an if-then test. var1=5 var2=4 if (( var1 > var2 )) then #^ ^ Note: Not $var1, $var2.
Advanced Bash-Scripting Guide by Mendel Cooper