Lesson 3 committed

Author: nathaline

Lesson03/Activity 8.txt

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+# Make sure you are in the ~/Lesson3 folder
+
+grep -c -E '^([^aeiou][aeiou]){2}[^aeiou]$' <words.txt
+
+grep -c -E '^([^aeiou][aeiou])+[^aeiou]?$' <words.txt
+
+grep -c -E '^(.).\1$' <words.txt
+
+grep -c -E '([aeiou])\1' <words.txt
+
+grep  -E '^(.)(.).\2\1$' <words.txt

Lesson03/Activity 9.txt

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+NAME=RUMPELSTILTSKIN
+LEN=${#NAME}
+LEN=$((LEN-1))
+
+echo {$LEN..0}
+
+eval echo {$LEN..0}
+
+echo '${NAME:{$LEN..0}:1}'
+
+echo '\$\{NAME:{$LEN..0}\:1\}'
+
+eval echo '\$\{NAME:{$LEN..0}\:1\}'
+
+echo '\\$\\{NAME:{$LEN..0}\\:1\\}'
+
+eval echo '\\$\\{NAME:{$LEN..0}\\:1\\}'
+
+eval eval echo '\\$\\{NAME:{$LEN..0}\\:1\\}'
+
+eval eval eval echo '\\$\\{NAME:{$LEN..0}\\:1\\}'
+
+tr -d ' ' <<< $(eval eval eval echo '\\$\\{NAME:{$LEN..0}\\:1\\}')

Lesson03/Exercise 13.txt

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+ # Step 1 
+cd ~/Lesson2
+
+ # Step 2 
+time sort payroll.tsv >sorted.txt
+
+ # Step 3 
+time (sort payroll.tsv >sorted.txt ; sort -k2 payroll.tsv >sorted2.txt)
+
+
+ # Step 4 
+time (sort payroll.tsv >sorted.txt & sort -k2 payroll.tsv >sorted2.txt)
+
+
+ # Step 5 
+time (sort payroll.tsv >sorted.txt ; sort -k2 payroll.tsv >sorted2.txt ;  sort -k3 payroll.tsv >sorted3.txt)
+time (sort payroll.tsv >sorted.txt & sort -k2 payroll.tsv >sorted2.txt &  sort -k3 payroll.tsv >sorted3.txt)
+
+ # Step 6 
+grep -q 'WALDO' payroll.tsv && echo 'Found'
+
+ # Step 7 
+grep -q 'PINOCCHIO' payroll.tsv || echo 'Not Found'

Lesson03/Exercise 14.txt

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+ # Step 1 
+cd ~/Lesson1/data
+
+ # Step 2 
+grep -m1 -w -E -R 'India|China' | less
+
+ # Step 3 
+grep -R --color -E '[0-9]{2}-[0-9]{2} m '
+
+
+ # Step 4 
+(grep -q -E '^[a-z][a-z0-9_]{,9}$' <<< 'hunter2' && echo 'Valid')  || echo 'Invalid'
+(grep -q -E '^[a-z][a-z0-9_]{,9}$' <<< 'hunter222' && echo 'Valid')  || echo 'Invalid'
+
+
+ # Step 5
+(grep -q -E '^[a-z][a-z0-9_]{,9}$' <<< '2hunter' && echo 'Valid')  || echo 'Invalid'
+(grep -q -E '^[a-z][a-z0-9_]{,9}$' <<< 'Hunter22' && echo 'Valid')  || echo 'Invalid'
+
+
+ # Step 6
+(grep -q -E '^[a-z][a-z0-9_]{,9}$' <<< 'hunter%2' && echo 'Valid')  || echo 'Invalid'
+(grep -q -E '^[a-z][a-z0-9_]{,9}$' <<< 'hunter12345678' && echo 'Valid')  || echo 'Invalid'
+
+
+ # Step 7 
+(grep -q -w -E '^\([[:digit:]]{3}\)$' <<< '(123)' && echo 'Valid')  || echo 'Invalid'
+
+
+ # Step 8
+(grep -q -w -E '^\([[:digit:]]{3}\)\ [[:digit:]]{3}$' <<< '(123) 456' && echo 'Valid')  || echo 'Invalid'
+
+
+ # Step 9 
+(grep -q -w -E '^\([[:digit:]]{3}\)\ [[:digit:]]{3}-[[:digit:]]{4}$' <<< '(123) 456-7890' && echo 'Valid')  || echo 'Invalid'
+
+
+ # Step 10 
+cd ~/Lesson3
+  
+
+ # Step 11 
+cat markdown.txt
+
+
+ # Step 12 
+grep --color -E '\*\*([a-z]+)\*\*' <markdown.txt
+
+
+ # Step 13 
+grep --color -E '_([a-z]+)_' <markdown.txt
+
+
+ # Step 14 
+sed -E -e 's#\*\*([a-z]+)\*\*#<b>\1</b>#g' <markdown.txt
+
+
+ # Step 15
+sed -E -e 's#\*\*([a-z]+)\*\*#<b>\1</b>#g' -e 's#_([a-z]+)_#<i>\1</i>#g' <markdown.txt

Lesson03/Exercise 15.txt

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+ # Step 1 
+NAME=Robin
+echo Hello $NAME
+
+
+ # Step 2 
+echo The answer is $((74088 / 42 / 42 + 42 - 42))
+echo The answer is $((2 * 3 + 4 * 5))
+
+
+  # Step 3 
+A=1 B=1 C=$((A + B)) && echo $A
+A=$B B=$C C=$((A + B)) && echo $A
+A=$B B=$C C=$((A + B)) && echo $A
+A=$B B=$C C=$((A + B)) && echo $A
+A=$B B=$C C=$((A + B)) && echo $A
+A=$B B=$C C=$((A + B)) && echo $A
+
+
+ # Step 4 
+cd Lesson3
+mkdir test && cd test
+echo {a..c}/{1..3}
+mkdir -p {a..c}/{1..3}
+tree 
+cd ..
+
+
+ # Step 5 
+echo The special cards in a deck are {'ace','king','queen','jack'}{' of spade,',' of diamond,',' of club,',' of heart,'}
+
+
+ # Step 6
+wc markdown.txt
+
+
+ # Step 7 
+OUTPUT=$(wc markdown.txt)
+echo $OUTPUT
+
+
+ # Step 8 
+OUTPUT=($OUTPUT)
+echo ${OUTPUT[@]}
+
+
+ # Step 9 
+WORDS=${OUTPUT[1]}
+CHARS=${OUTPUT[2]}
+
+
+ # Step 10 
+echo Average chars per word is $((CHARS / WORDS))
+
+
+ # Step 11 
+echo The exact average is $(bc <<< "scale=2; $CHARS / $WORDS ")
+
+
+ # Step 12 
+ANSWER=42
+QUESTION=ANSWER
+WHAT=QUESTION
+
+
+ # Step 13
+echo ${WHAT}
+
+
+ # Step 14 
+echo \${${WHAT}}
+
+
+ # Step 15 
+eval echo \${${WHAT}}
+
+
+ # Step 16 
+echo $(eval echo \${${WHAT}})
+echo \${$(eval echo \${${WHAT}})}
+
+
+ # Step 17 
+eval echo \${$(eval echo \${${WHAT}})}
+
+
+ # Step 18 
+cd ~/Lesson2
+
+
+ # Step 19 
+cp payroll.tsv 1.txt ; cp payroll.tsv 2.txt ; cp payroll.tsv 3.txt
+
+
+ # Step 20
+sort payroll.tsv >log.txt
+
+
+ # Step 21 
+sort -m log.txt <(sort 1.txt) <(sort 2.txt) <(sort 3.txt) >sortmerge.txt
+
+
+ # Step 22
+ls *.txt
+rm *.txt
+rm -r ../Lesson3/test

Lesson03/markdown.txt

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+A **fly** and a **flea** in a flue,
+They were trapped, so they thought "What to _do_?"
+"Let us _fly_!" said the **flea**,
+"Let us _flee_!" said the **fly**,
+So, they _flew_ through a flaw in the _flue_!