33 lines
1.5 KiB
Bash
33 lines
1.5 KiB
Bash
line() { sed -n "$1p" /root/lab-answers/1 2>/dev/null | sed 's/[[:space:]]*$//'; }
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# hello.sh in root's home or a user's: executable, a #! line, two lines or more.
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script_ok() {
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local f
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for f in /root/hello.sh /home/*/hello.sh; do
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[ -f "$f" ] && [ -x "$f" ] && head -n1 "$f" | grep -q '^#!' && [ "$(grep -c . "$f")" -ge 2 ] && return 0
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done
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return 1
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}
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builtins_ok() {
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local a; a=$(tr -s ',[:space:]' '\n\n' </root/lab-answers/4 2>/dev/null)
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printf '%s\n' "$a" | grep -qx cd && printf '%s\n' "$a" | grep -qx echo &&
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! printf '%s\n' "$a" | grep -qxE 'ls|ssh'
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}
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task 1 "The four echo outputs"
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need "line 1 of /root/lab-answers/1 is what echo '\$HOME' prints" '[ "$(line 1)" = "\$HOME" ]'
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need "line 2 is what echo \"\$HOME\" prints for root" '[ "$(line 2)" = /root ]'
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need "line 3 is what echo \\\$HOME prints" '[ "$(line 3)" = "\$HOME" ]'
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need "line 4 is what echo \"It's \$USER\" prints for root" '[ "$(line 4)" = "It'\''s root" ]'
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task 2 "An exported variable seen by a child shell" self
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task 3 "hello.sh runs with ./; the reason it doesn't run by name"
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need "an executable hello.sh with a #! line and two lines or more is in a home directory" script_ok
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need "/root/lab-answers/3 explains it with PATH" 'grep -qi path /root/lab-answers/3'
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task 4 "The shell builtins among cd, ls, echo and ssh"
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need "/root/lab-answers/4 lists cd and echo, and not ls or ssh" builtins_ok
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task 5 "The man page for the crontab file format"
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need "/root/lab-answers/5 opens section 5 of crontab" 'grep -Eq "(^|[^0-9])5([^0-9]|$)" /root/lab-answers/5 && grep -q crontab /root/lab-answers/5'
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