mkdir regexps25
cd regexps25/
wget https://ufal.mff.cuni.cz/~zabokrtsky/courses/npfl125/data/udhr.zip
unzip udhr.zip 
less udhr/eng 
cat udhr/eng | grep right
cat udhr/eng | grep right | wc -l
cat udhr/eng |  wc -l
cat udhr/eng | grep A | wc -l
cat udhr/eng | grep  | less
cat udhr/eng | grep -i A | wc -l
cat udhr/eng | grep -n A 
cat udhr/eng | grep "^A" | less
cat udhr/eng | grep -v "^A" | less
cat udhr/eng |  less
cat udhr/eng |  grep "," | wc -l
cat udhr/eng |  grep ",$" | wc -l
cat udhr/eng |   less 
cp udhr/eng eng
dos2unix eng
cat eng |  grep ",$" | wc -l
less eng
cat eng |  grep -v "." | wc -l
echo -e "nonempty\n\n\n"  |  grep -v "." | wc -l
echo -e "nonempty\n\n\n"  
man echo
echo -ne "nonempty\n\n\n"  |  grep -v "." | wc -l
echo -ne "nonempty\n\n\n"  |  grep "^$" | wc -l
echo -ne "nonempty\n\n\n"  
echo "hi"
echo -n "hi"
echo -ne "nonempty\n\n\n"  | grep .
echo -ne "1\n23\n456\n\n"  
echo -ne "1\n23\n456\n\n"  | grep .
echo -ne "1\n23\n456\n\n"  | grep ..
echo -ne "1\n23\n456\n\n"  | grep .
echo -ne "1\n23\n456\n7890\n"  | grep .{3}
echo -ne "1\n23\n456\n7890\n"  | grep -E .{3}
man grep
echo -ne "1\n23\n456\n7890\n"  | grep -E .{2,5}
echo -ne "1\n23\n456\n7890\n"  | grep -E ".{2,5}"
man grep
echo -ne "1\n23\n456\n7890\n"  | grep ".\{2,5\}"
echo -ne "1\n23\n456\n7890\n"  | grep "^.$"
echo -ne "1\n23\n456\n7890\n"  | grep "^.{3}$"
echo -ne "1\n23\n456\n7890\n"  | grep -E "^.{3}$"
echo -ne "1\n23\n456\n7890\n"  | grep -E "^.+$"
echo -ne "1\n23\n456\n7890\n"  | grep -E "^.*$"
echo -ne "1\n23\n456\n7890\n\n"  | grep -E ""
less eng 
echo eng  | grep -E "^A"
cat eng  | grep -E "^A"
cat eng  | grep -E "^W"
cat eng  | grep -E "^W" | wc -l
cat eng  | grep -E "^A" | wc -l
cat eng  | grep -E "^[AW]" | wc -l
cat eng  | grep -E "^[0-9]" | wc -l
cat eng  | grep -E "[0-9]" | wc -l
cat eng  | grep -E "[0-9]" | less
cat eng  | grep -E "^[A-S]" | less
cat eng  | grep -E "^[A-Z]" | less
cat eng  | grep -E "^[a-z]" | less
echo -ne "first\nSecond\n"  | grep -E "^[a-z]" 
echo -ne "first\nSecond\n"  | grep -E "^[A-Z]" 
echo -ne "first\nSecond\n"  | grep -E "^[a-zA-Z]" 
echo -ne "first\nsecond\nthird\n"  | grep -E "^(first|second)" 
cat eng  | grep -E "^(human|right)"  | wc -l
cat eng  | grep -E "(human|right)"  | wc -l
cat eng  | grep -E "(right)" 
cat eng  | grep -E "(right)"  | wc -l
cat eng  | grep -E "(human)"  | wc -l
cat eng  | grep -E "(human|right)"  | wc -l
cat eng  | grep -E "The[^ ]"  
cat eng  | grep -oE "The[^ ]"  
cat eng  | grep -oE "The[^ ]+"  
cat eng  | grep -oE "[,.;"'()]"  
cat eng  | grep -oE "[,.;\"'()]"  
cat eng  | grep -oE "[[:punct:]]"  
cat eng  | grep -oE "[,.;\"'()]"  | wc -l
cat eng  | grep -oE "[[:punct:]]"  | wc -l
cat eng  | grep -oE ".{25}"  | wc -l
cat eng  | grep -oE ".{25,}"  | wc -l
cat eng  | grep -E ".{25,}"  | wc -l
cat eng  | grep -E ".{25}"  | wc -l
cat eng  | grep -E ".{10}"  | wc -l
cat eng  | grep -E ".{10,}"  | wc -l
cat eng  | grep -E ".{40,}"  | wc -l
cat eng  | grep -E ".{50,}"  | wc -l
cat eng  | grep -E ".{50}"  | wc -l
echo -ne "1\n23\n456\n7890"
echo -ne "1\n23\n456\n7890\n" | grep ".{3,}
echo -ne "1\n23\n456\n7890\n" | grep ".{3,}"
echo -ne "1\n23\n456\n7890\n" | grep ".{3}"
echo -ne "1\n23\n456\n7890\n" | grep -E ".{3,}"
echo -ne "1\n23\n456\n7890\n" | grep -E ".{2,}"
echo -ne "1\n23\n456\n7890\n" | grep -E ".{,3}"
echo -ne "1\n23\n456\n7890\n" | grep -E "^.{,3}$"
echo příliš | grep -o .  | grep -E "[[:alpha:]]"
echo příliš | grep -o .  | grep -E "[a-z]"
echo příliš | grep -o .  | grep -E "[a-ž]"
echo příliš | grep -o .$
ls *hist*
ls copy_bash_history 
less copy_bash_history 
scp copy_bash_history zabokrtsky@osiris:
copy .bash_history history_from_2025_10_29.txt
cp .bash_history history_from_2025_10_29.txt
whoami
touch x
ls
pwd
cd
touch x
exit