shell基礎--cat命令的使用

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一.cat的常用用法

1.總結

2.實驗

(1).非互動式編輯

[[email protected]~_~ day5]# cat > cattest.sh <<STOP

> hello

> STOP

[[email protected]~_~ day5]# cat cattest.sh

hello

[[email protected]~_~ day5]# cat > cattest.sh << EOF

hello cat with EOF

EOF

[[email protected]~_~ day5]# cat cattest.sh

hello cat with EOF

[[email protected]~_~ day5]# cat > cattest.sh <<~_~

> hdhhdhdhhdhd

> ~_~

[[email protected]~_~ day5]# cat cattest.sh

Hdhhdhdhhdhd

 

(2).清空檔案內容

[[email protected]~_~ day5]# cat cattest.sh

Hdhhdhdhhdhd

[[email protected]~_~ day5]# cat /dev/null > cattest.sh

[[email protected]~_~ day5]# cat cattest.sh

(3).合并

[[email protected]~_~ day5]# cat > cattest.sh <<EOF

> hello

> EOF

[[email protected]~_~ day5]# cat >  cattest2.sh <<EOF

> world

> EOF

[[email protected]~_~ day5]# cat cattest.sh cattest2.sh >newfile.sh

[[email protected]~_~ day5]# cat newfile.sh

hello

world

 [[email protected]~_~ day5]# cat newfile.sh

hello

world

二.cat命令常用選項

1.總結

 

shell基礎--cat命令的使用