715.6 Customize or Write Simple Scripts (weight: 2) BSD-SPECIALIST Practice Questions (Page 4)

Questions 16–20

1. 16application · easy

   A user creates a script file 'myscript' with the correct content and runs './myscript'. The shell reports 'Permission denied'. What is the most likely cause and fix?

   • AThe script has a syntax error; run 'sh -n myscript' to find it
   • BThe file lacks execute permission; run 'chmod +x myscript'
   • CThe script is in the wrong directory; move it to /usr/local/bin
   • DThe shebang line is missing; add '#!/bin/sh' as the first line
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   Which loop construct in a shell script repeats a block of code a fixed number of times?

   • Afor loop
   • Bwhile loop
   • Ccase loop
   • Duntil loop
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4. 18application · medium

   A developer on a FreeBSD system creates a script with a csh-style syntax and saves it as 'deploy.csh'. The script must run on multiple Unix-like systems, some of which do not have csh installed. The developer wants maximum portability with minimal changes. What should the developer do?

   • AKeep the csh syntax and rely on the .csh extension to invoke the correct interpreter
   • BRewrite the script using POSIX Bourne shell syntax and set the shebang to #!/bin/sh
   • CKeep the csh syntax and change the shebang to #!/bin/sh
   • DInstall csh on every target system to ensure the script runs unchanged
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   In a shell script, what does $1 represent?

   • AThe number of command-line arguments
   • BThe first command-line argument passed to the script
   • CThe name of the script itself
   • DThe exit status of the last command
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A FreeBSD administrator maintains a script that must run on both FreeBSD and a minimal Linux container that only has dash as /bin/sh. The script currently uses bash-specific features like [[ ]] and arrays. The administrator must make the script portable with the least effort. What is the best approach?

   • AInstall bash in the Linux container and keep the script unchanged
   • BChange the shebang to #!/bin/bash and assume bash is present on FreeBSD
   • CRewrite the script using POSIX sh syntax, replacing [[ ]] with [ ] and arrays with positional parameters or loops
   • DUse csh syntax, since it is native to FreeBSD and available in most Linux distributions
   Reveal Solution Discussion Select an answer first