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cat file1 file1
tac file1 file1 ( ..)
more file1 file1
less file1 file1 , (-), ..
head -2 file1 file1 . -
tail -2 file1 file1 . -
tail -f /var/log/messages /var/log/messages .

cat file | grep -i "Criteria" > result.txt
cat file | grep -i "Criteria" result.txt . ,
grep Aug /var/log/messages '/var/log/messages' , "Aug"
grep ^Aug /var/log/messages '/var/log/messages' , "Aug"
grep [0-9] /var/log/messages '/var/log/messages' ,
grep Aug -R /var/log/* , "Aug", , /var/log
sed 's/stringa1/stringa2/g' example.txt example.txt "string1" "string2", .
sed '/^$/d' example.txt example.txt
sed '/ *#/d; /^$/d' example.txt example.txt
echo 'test' | tr '[:lower:]' '[:upper:]'
sed -e '1d' result.txt example.txt
sed -n '/string1/p' "string1"
sed -e 's/ *$//' example.txt
sed -e 's/string1//g' example.txt "string1"
sed -n '1,8p;5q' example.txt
sed -n '5p;5q' example.txt
sed -e 's/0*/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 file1 file2 : 1 file1 = 1 1-n, 1 file2 = 1 n+1-m
paste -d '+' file1 file2 file1 file2 "+"
sort file1 file2
sort file1 file2 | uniq ,
sort file1 file2 | uniq -u , (, , )
sort file1 file2 | uniq -d ,
comm -1 file1 file2 , 'file1'
comm -2 file1 file2 , 'file2'
comm -3 file1 file2 ,




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