Shell script for change and replace using “sed”

Question

尝试编写test1.ksh，其中包含用于搜索“％s_sitename％”字符串并将其替换为“％s_sitename％”的命令，并且今天在文件test.sql中显示日期：

s1='%s_sitename%' s2=echo date "+%Y-%b-%e" s3=$s1$s2 sed -i 's/'"$s1"'/'"$s3"'/g' test.sql exit

Answer 1

s2=echo date "+%Y-%b-%e"

is wrong. First you don't need echo, second you didn't enclose the command inside backticks (``)

s1='%s_sitename%'
s2='%s_sitename%'"$(date "+%Y-%b-%e")"
sed -i 's/'"$s1"'/'"$s2"'/g' test.sql

Should do it.