By Mendel Cooper
This can be the full reference at the Borne back shell (bash). quantity 1Volume 2 comprises all appendices.
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Extra resources for Advanced Bash-Scripting Guide
Tests 50 Advanced Bash-Scripting Guide echo # When is "false" true? echo "Testing \"false\"" if [ "false" ] # It seems that "false" is just a string. " #+ and it tests true. " fi # "false" is true. echo echo "Testing \"\$false\"" # Again, uninitialized variable. " fi # "$false" is false. # Now, we get the expected result. # What would happen if we tested the uninitialized variable "$true"? echo exit 0 Exercise. Explain the behavior of Example 7-1, above. if [ condition-true ] then command 1 command 2 ...
Echo echo "Testing \"\$xyz\"" if [ $xyz ] # Tests if $xyz is null, but... # it's only an uninitialized variable. " fi # Uninitialized variable is false. echo echo "Testing \"-n \$xyz\"" if [ -n "$xyz" ] # More pedantically correct. " fi # Uninitialized variable is false. echo xyz= # Initialized, but set to null value. " fi # Null variable is false. Chapter 7. Tests 50 Advanced Bash-Scripting Guide echo # When is "false" true? echo "Testing \"false\"" if [ "false" ] # It seems that "false" is just a string.
Hello # "Hello" ... he said. 98. \\ gives the backslash its literal meaning echo "\\" # Results in \ # Whereas . . echo "\" # Invokes secondary prompt from the command line. # In a script, gives an error message. # However . . echo '\' # Results in \ The behavior of \ depends on whether it is escaped, strong-quoted, weak-quoted, or appearing within command substitution or a here document. echo echo echo echo echo echo \z \\z '\z' '\\z' "\z" "\\z" echo echo echo echo echo echo echo echo `echo `echo `echo `echo `echo `echo `echo `echo \z` \\z` \\\z` \\\\z` \\\\\\z` \\\\\\\z` "\z"` "\\z"` Chapter 5.
Advanced Bash-Scripting Guide by Mendel Cooper