任意一种:
a) head -10 file.txt
b) cat file.txt | head -10
c) sed “11,$ d” file.txt
head -10 file.txt | tail -1
sed -i “13 d” file.txt
sed -i “$ d” file.txt
echo “Hello” | rev
echo $?
cat file.txt | wc -l
cat file.txt | wc -c
head -17 file.txt | tail -1 | wc -c
head -17 file.txt | tail -1 | cut -f3 -d’ ‘
chmod 555 file.txt
chgrp new_group file.txt
cat file1.txt file2.txt > file.txt
ps -aef
sort -u file1.txt > file2.txt
whoami
ssh username@remote-server
grep “cat” file.txt
grep -w “cat” file.txt
grep -v -w “cat” file.txt
grep -i “cat” file.txt
grep “^cat” file.txt
grep “cat$” file.txt
grep “cat.*123” file.txt
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