shell练习1：删除目录下指定文件中的指定行

删除lianxi目录下所有的a.txt文件里的所有内容为”lucy”的行

[root@vmcentos lianxi]# for i in {1..5};do echo "test" >> $i/a.txt;done

[root@vmcentos lianxi]# for i in {1..5};do echo "lucy" >> $i/a.txt;done

[root@vmcentos lianxi]# find /root/lianxi -name a.txt -exec sed -i '/lucy/d' {} \;

[root@vmcentos lianxi]# cat {1..5}/a.txt

test

test

test

test

test

[root@vmcentos lianxi]# for i in {1..5};do echo "lucy" >> $i/a.txt;done

[root@vmcentos lianxi]# cat 1/a.txt

test

lucy

[root@vmcentos lianxi]# find . -name a.txt | xargs sed -i '/lucy/d'

[root@vmcentos lianxi]# cat {1..5}/a.txt

test

test

test

test

test

备忘

find /root/lianxi -name a.txt | xargs ls -lh
find /root/lianxi -name a.txt -exec ls -lh {} \;

[root@vmcentos 1]# cat a.txt
lucy
test
[root@vmcentos 1]# sed -i '/^l.*/d' a.txt
[root@vmcentos 1]# cat a.txt
test
[root@vmcentos 1]# vi a.txt
[root@vmcentos 1]# cat a.txt
test
lucy
[root@vmcentos 1]# sed -i 's/^l.*/haha/g' a.txt
[root@vmcentos 1]# cat a.txt
test
haha
[root@vmcentos 1]#