linux基础命令_4

cat > helei.txt << EOF
helei
haohao xuexi
tiantian xiangshagn
EOF

• grep -v helei helei.txt
  • -v 排除(见下图)
  • grep 过滤

  • grep(grep "he" helei.txt)

    
    
    排除.png
    
    
    过滤.png

-   head -2 helei.txt
-   head  helei.txt 默认显示前10行

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三剑客.png

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