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cat file1 file2 ... | command <> file1_in.txt_or_file1_out.txt
cat file1 | command( sed, grep, awk, grep, etc...) > result.txt
cat file1 | command( sed, grep, awk, grep, etc...) >> result.txt
grep Aug /var/log/messages
grep ^Aug /var/log/messages
grep [0-9] /var/log/messages
grep Aug -R /var/log/*
sed 's/stringa1/stringa2/g' example.txt
sed '/^$/d' example.txt
sed '/ *#/d; /^$/d' example.txt
echo 'esempio' | tr '[:lower:]' '[:upper:]'
sed -e '1d' result.txt
sed -n '/stringa1/p'
sed -e 's/ *$//' example.txt
sed -e 's/stringa1//g' example.txt
sed -n '1,5p;5q' example.txt
sed -n '5p;5q' example.txt
sed -e 's/00*/0/g' example.txt
cat -n file1
cat example.txt | awk 'NR%2==1'
echo a b c | awk '{print $1}'
echo a b c | awk '{print $1,$3}'
paste file1 file2
paste -d '+' file1 file2
sort file1 file2
sort file1 file2 | uniq
sort file1 file2 | uniq -u
sort file1 file2 | uniq -d
comm -1 file1 file2
comm -2 file1 file2
comm -3 file1 file2
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