我有一个配置文件(来自 Nagios),其结构如下:
define service{
use pruebaspre-service,srv-pnp
host_name server1.es
servicegroups pruebasdatasourcesoaspre-servicegroup,pruebaspre-servicegroup
service_description Estado DataSource - cfio JUVEPoolDSPoolDS
check_command check_ds_oas!cfio!JUVEPoolDSPoolDS!/opt/oracle/ias10g/10.1.2!1!0
}
define service{
use pruebaspre-service,srv-pnp
host_name server1.es
servicegroups pruebasdatasourcesoaspre-servicegroup,pruebaspre-servicegroup
service_description Estado DataSource - cfio REMEPoolDS
check_command check_ds_oas!cfio!REMEPoolDS!/opt/oracle/ias10g/10.1.2!1!0
}
define service{
use pruebaspre-service,srv-pnp
host_name server2.es
servicegroups pruebasdatasourcesoaspre-servicegroup,pruebaspre-servicegroup
service_description Estado DataSource - cfio iris_usr_irisPoolDS
check_command check_ds_oas!cfio!iris_usr_irisPoolDS!/opt/oracle/ias10g/10.1.3!1!0
}
define service{
use pruebaspre-service,srv-pnp
host_name server2.es
servicegroups pruebasdatasourcesoaspre-servicegroup,pruebaspre-servicegroup
service_description Estado DataSource - cfio REMEPoolDS
check_command check_ds_oas!cfio!REMEPoolDS!/opt/oracle/ias10g/10.1.2!1!0
}
define service{
use pruebaspre-service,srv-pnp
host_name server2.es
servicegroups pruebasdatasourcesoaspre-servicegroup,pruebaspre-servicegroup
service_description Estado DataSource - cfio redt2_usr_redt2PoolDS
check_command check_ds_oas!cfio!redt2_usr_redt2PoolDS!/opt/oracle/ias10g/10.1.3!1!0
}
要在此文件中注册新服务,我需要首先查找该服务是否存在,为此我必须找到该check_command
服务host_name
未注册。
例如我要注册:
define service {
use pre-service tests, srv-pnp
host_name server1.es
servicegroups testsdatasourcesoaspre-servicegroup, pre-servicegroup tests
service_description DataSource Status - cfio REMEPoolDS
check_command check_ds_oas! cfio! REMEPoolDS! /opt/oracle/ias10g/10.1.2! 1! 0
}
所以在文件中我应该寻找它不存在。
我用 while 循环尝试了读取文件并在找到时
check_command check_ds_oas! Cfio! REMEPoolDS! /Opt/oracle/ias10g/10.1.2! 1! 0
它看起来不会是下一个
host_name server1.es
V_NAGIOS_COMMAND=check_ds_oas!cfio!REMEPoolDS!/opt/oracle/ias10g/10.1.2!1!0
if [ `grep ${V_NAGIOS_COMMAND} --count $V_FILE_NAGIOS` -ge 1 ] ; then
while read LINEA_CONFIG
do
V_DIRECTIVA=`echo $LINEA_CONFIG| awk '{print $1} '`
V_VALOR_DIRECTIVA=`echo $LINEA_CONFIG| awk '{print $2} '`
if [ $V_DIRECTIVA = check_command ]&&[ $V_VALOR_DIRECTIVA = $V_NAGIOS_COMMAND ]; then
V_COMANDO_ENCONTRADO=1
elif [ $V_DIRECTIVA = host_name ]&& [ $V_COMANDO_ENCONTRADO = 1 ] ; then
if [ $V_VALOR_DIRECTIVA = $V_MAQUINA ] ; then
((V_EXISTEN_DATOS++))
return 1
else
V_COMANDO_ENCONTRADO=0
fi
fi
done < <(tac $V_FILE_NAGIOS| grep -vE "^#|^$")
fi
但它很慢。
答案1
如果我很好地理解了您的要求,那么这看起来是一项sed
可以做得很好的工作,因为它能够在输入流中分隔“子流”。
这应该是 POSIX:
sed -n "/^define service/,/^}/{/^[[:blank:]]\\{1,\}host_name[[:blank:]]\\{1,\\}${V_MAQUINA}/,/^}/{\\%^[[:blank:]]\\{1,\\}check_command[[:blank:]]\\{1,\\}${V_NAGIOS_COMMAND}%{p;q}}}" file
或者,如果您可以使用 GNU sed,可以减少字符串中的转义:
sed -En "/^define service/,/^\\}/{/^[[:blank:]]+host_name[[:blank:]]+${V_MAQUINA}/,/^\\}/{\\%^[[:blank:]]+check_command[[:blank:]]+${V_NAGIOS_COMMAND}%{p;q}}}" file
解释:
sed -En # use Extended Regular Expressions, and don't print by default
# main `sed` script for entire stream
/^define service/,/^\\}/ # between 'define service' and '}'
{ # sub-stream: between specified 'host_name' and '}'
/^[[:blank:]]+host_name[[:blank:]]+${V_MAQUINA}/,/^\\}/
{ # look for specified 'check_command', using '%' because '/' can be in command
\\%^[[:blank:]]+check_command[[:blank:]]+${V_NAGIOS_COMMAND}%
{p;q} # if found, print line and quit `sed`
}
}
check_command
如果在由正则表达式分隔的“snippet”中找到该行,则打印该行file
,如果未找到,则不打印任何内容。
因此,您只需检查返回的字符串是否存在。
不检查退出状态,因为sed
当没有打印任何内容时也会退出 0。
一些附加说明:
- 我们需要
\\
表达 1\
因为我们在 shell 的双引号内 - 我们使用双引号来使用 shell 的
$V_MAQUINA
变量$V_NAGIOS_COMMAND
- 我在上一个正则表达式中选择了作为正则表达式分隔符,但是您可以自由选择变量
%
中不会出现的任何字符$V_NAGIOS_COMMAND
答案2
在 awk 中:
/^define service/{
found_command=0
found_host=0
while (getline && $0 !~ "^}") {
# test host
if($1 == "host_name") {
if ($2 == new_host) {
found_host=1
}else{
next
}
}
# test check_command
if($1 == "check_command"){
cmd = gensub(/^\s*check_command\s*/, "", 1)
if (cmd == new_command) {
found_command=1
}else{
next
}
}
}
if (found_command && found_host)
exit 1
}
可以这样使用:
new_host='...'
new_command='...'
if awk -v new_host="$new_host" -v new_command="$new_command" -f script.awk cfg_file ; then
echo "you can register it now"
fi