我有以下功能:

#!/bin/bash

get_instance{
dbname=$(sqlplus -s / as sysdba<<EOF
set pages 0
set feedback off
select name from v\$database;
exit;
EOF)

echo $dbname

}

get_instance

似乎很管用。在错误消息的中间,我得到我的dbname,但仍然返回语法错误。
 oracle@testdb01:db01:/home/oracle/
 > ./test.sh
 ./test.sh: line 3: get_instance{: command not found
 DB01
 ./test.sh: line 11: syntax error near unexpected token `}'
 ./test.sh: line 11: `}'

如果完全删除函数调用,则得到的结果没有错误:
dbname=$(sqlplus -s / as sysdba<<EOF
set pages 0
set feedback off
select name from v\$database;
exit;
EOF)
echo $dbname

oracle@testdb01:db01:/home/oracle
> ./test.sh
DB01

我需要做什么才能让它在函数中工作?
编辑:
以下建议将括号放在EOF标记后并添加函数关键字:
 > vi test.sh
 "test.sh" 12 lines, 160 characters

#!/bin/bash
# updated file
function get_instance{
dbname=$(sqlplus -s / as sysdba<<EOF
set pages 0
set feedback off
select name from v\$database;
exit;
EOF
)
echo $dbname
}

get_instance

oracle@testdb01:db01:/home/oracle
> ./test.sh
./test.sh: line 10: syntax error near unexpected token `dbname=$(sqlplus -s / as sysdba<<EOF
set pages 0
set feedback off
select name from v\$database;
exit;
EOF
)'

./test.sh:第10行:`'

最佳答案

函数声明错误:

get_instance{

应该是
function get_instance {
get_instance() {

将闭合托架放在另一条线上:
dbname=$(sqlplus -s / as sysdba<<EOF
...
EOF
)

heredoc的终止字应该是行上的唯一字符(使用<<-时的制表符除外)。演示:
$ x=$(cat <<END
> one
> two
> END)
bash: warning: here-document at line 5 delimited by end-of-file (wanted `END')
$ echo "$x"
one
two

所以它意外地成功了。更好的做法是:
$ y=$(cat <<END
> 1
> 2
> END
> )
$ echo "$y"
1
2

10-07 16:17
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