Starting at the left, each (Photo web hosting) statement is executed
Starting at the left, each statement is executed and, if it returns true, the next statement to the right This continues until a statement returns false, after which no more statements in the list The &&tests the condition of the preceding command. Each statement is executed independently, allowing us to mix many different commands in a single the following script shows. The AND list as a whole succeeds if all commands are executed success- fully, but it fails otherwise. Try It Out AND ListsIn the following script, we touchfile_one(to check whether it exists and create it if it doesn t) andthen remove file_two. Then the AND list tests for the existence of each of the files and echoes sometext in between. #!/bin/shtouch file_onerm -f file_twoif [ -f file_one ] && echo hello && [ -f file_two ] && echo there thenecho in if elseecho in else fiexit 0Try the script and you ll get the following result: helloin elseHow It WorksThe touchand rmcommands ensure that the files in the current directory are in a known state. The list then executes the [ -f file_one ]statement, which succeeds because we just made sure that existed. Because the previous statement succeeded, the echocommand is executed. This also suc- ceeds (echoalways returns true). The third test, [ -f file_two ]is executed. It fails because the exist. Because the last command failed, the final echostatement isn t executed. The result of list is falsebecause one of the commands in the list failed, so the ifstatement executes its elsecondition. The OR ListThe OR list construct allows us to execute a series of commands until one succeeds, then not execute The syntax isstatement1 ||statement2 ||statement3 ||…