| Challenge | Solution |
|---|---|
| Head of a Text File #1 | head -n 20 |
| Head of a Text File #2 | head -c 20 |
| Middle of a Text File | head -22 | tail -11 |
| Tail of a Text File #1 | tail -n 20 |
| Tail of a Text File #2 | tail -c 20 |
| Paste - 1 | paste -sd ';' |
| Paste - 2 | paste -d ';' - - - |
| Paste - 3 | paste -sd "\t" |
| Paste - 4 | paste -d '\t' - - - |
| Cut #1 | cut -c 3 |
| Cut #2 | cut -c 2,7 |
| Cut #3 | cut -c 2-7 |
| Cut #4 | cut -c 1-4 |
| Cut #5 | cut -f 1-3 |
| Cut #6 | cut -c 13- |
| Cut #7 | cut -f 4 -d " " |
| Cut #8 | cut -f 1-3 -d " " |
| Cut #9 | cut -f 2- |
| Sort Command #1 | sort |
| Sort Command #2 | sort -r |
| Sort Command #3 | sort -n |
| Sort Command #4 | sort -nr |
| Sort Command #5 | sort -t $'\t' -nr -k 2 |
| Sort Command #6 | sort -nt $'\t' -k 2 |
| Sort Command #7 | sort -nrt $'|' -k 2 |
| 'Uniq' Command #1 | uniq |
| 'Uniq' Command #2 | uniq -c | cut -c 7- |
| 'Uniq' Command #3 | uniq -ci | cut -c 7- |
| 'Uniq' Command #4 | uniq -u |
| 'Tr' Command #1 | tr "()" "[]" |
| 'Tr' Command #2 | tr -d "a-z" |
| 'Tr' Command #3 | tr -s ' ' ' ' |
| Challenge | Solution |
|---|---|
| 'Grep' #1 | grep -w "the" Or grep "\bthe\b" |
| 'Grep' #2 | grep -iw "the" |
| 'Grep' #3 | grep -ivw "that" |
| 'Grep' - A | grep -iwE "the|that|then|those" Or grep -iw -e "the" -e "that" -e "then" -e "those" Or grep -iE "\bthe\b|\bthat\b|\bthen\b\bthose\b" |
| 'Grep' - B | grep '\([0-9]\) *\1' |
| 'Sed' command #1 | sed 's/\bthe\b/this/' |
| 'Sed' command #2 | sed 's/thy/your/gi' |
| 'Sed' command #3 | sed 's/thy/{&}/gi' |
| 'Sed' command #4 | sed 's/[0-9]\+ /**** /g' |
| 'Sed' command #5 | sed -E 's/(.... )(.... )(.... )(....)/\4 \3\2\1/' |
| 'Awk' - 1 | awk '{if (NF != 4) print "Not all scores are available for "$1}' Or awk '{if (NF < 4){print "Not all scores are available for "$1}}' |
| 'Awk' - 2 | awk '{if ($2 < 50 || $3 < 50 || $4 < 50){print $1,": Fail"}else {print $1,": Pass"}}' Or awk '{print $1,":", ($2<50||$3<50||$4<50) ? "Fail" : "Pass"}' |
| Awk' - 3 | awk '{avg=($2+$3+$4)/3; print $0, ":", (avg<50)?"FAIL":(avg<80)?"B":"A"}' |
| 'Awk' - 4 | awk 'ORS = NR%2? ";" : "\n" ' |
| Challenge | Solution | File |
|---|---|---|
| Let's Echo | echo "HELLO" |
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| The World of Numbers | read a read b let sum=$a+$b let difference=$a-$b let product=$a*$b let quotient=$a/$b echo -e "$sum\n$difference\n$product\n$quotient" |
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| More on Conditionals | read x read y read z if ([ "$x" = "$y" ] && [ "$x" = "$z" ] && [ "$y" = "$z" ]) ; then echo "EQUILATERAL" elif ( [ "$x" = "$y" ] || [ "$x" = "$z" ] || [ "$y" = "$z" ] ); then echo "ISOSCELES" else echo "SCALENE" fi |
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| Looping and Skipping | for i in {1..99}; do if [ $(($i%2)) -ne "0" ]; then echo "$i" fi done |
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| Looping with Numbers | for i in {1..50}; do echo "$i" done |
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| Getting started with conditionals | read var if [ "$var" == "y" -o "$var" == "Y" ] ; then echo "YES" else echo "NO" fi |
↗ |
| Compute the Average | read n for i in $(seq 1 $n); do read x ((sum+=$x)) done avg=$(echo "$sum /$n"|bc -l) printf "%.3f \n" $avg |
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| Arithmetic Operations | read input; res=$(echo "$input" | bc -l) printf "%.3f \n" $res |
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| A Personalized Echo | read name echo "Welcome $name" |
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| Comparing Numbers | read x read y if [ $x -lt $y ]; then echo "X is less than Y" elif [ $x -gt $y ]; then echo "X is greater than Y" else echo "X is equal to Y" fi or read x read y if (( $x < $y )); then echo "X is less than Y" elif (( $x > $y )); then echo "X is greater than Y" else echo "X is equal to Y" fi |
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