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Use of Colon in Shell script Sometimes it is useful to have a command which does “nothing”. The : (colon) command in Unix does nothing #!/bin/sh if grep unix myfile then : else echo “Sorry, unix was not found” fi
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Use of Semicolons in Shell Script Instead of being on separate lines, statements can be separated by a semicolon (;) – For example: if grep “UNIX” myfile; then echo “Got it”; fi – This actually works anywhere in the shell. % cwd=`pwd`; cd $HOME; ls; cd $cwd
if Statement in Shell Script Simple form: if decision_command_1 then command_set_1 fi Example: if grep unix myfile >/dev/null then echo “It’s there” fi
for Loops in Shell Script for loops allow the repetition of a command for a specific set of values Syntax: for var in value1 value2 … do command_set done – command_set is executed with each value of var (value1, value2, …) in sequence for loop example in shell script #!/bin/sh # timestable – print out … Read more
As with all types of activities which have a darker side, there will be…..dishonest people presenting drawbacks. The possible drawbacks of ethical hacking include: The ethical hacker using the knowledge they gain to do malicious hacking activities Allowing the company’s financial and banking details to be seen The possibility that the ethical hacker will send … Read more