[英]Appending a line just after the matched pattern in sed not working
我的/etc/pam.d/system-auth-ac
设置了以下auth
参数:
auth required pam_env.so
auth sufficient pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 500 quiet
auth required pam_deny.so
我想在pam_env.so
之后插入pam_tally2.so
。 所以我希望它是:
auth required pam_env.so
auth required pam_tally2.so onerr=fail audit silent deny=5 unlock_time=900
auth sufficient pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 500 quiet
auth required pam_deny.so
我正在使用的脚本是:
#! /bin/bash
grep "pam_tally2" /etc/pam.d/system-auth-ac &> /dev/null
if [ $? -ne 0 ];
then
sed -i '/^[]*account[]*required[]*pam_unix.so/aauth\trequired\tpam_tally2.so onerr=fail audit silent deny=5 unlock_time=900' /etc/pam.d/system-auth-ac
else
sed -i 's/.*pam_tally2.*/auth\trequired\tpam_tally2.so onerr=fail audit silent deny=5 unlock_time=900/1' /etc/pam.d/system-auth-ac
fi
但是它给出了这个错误:
sed: -e expression #1, char 116: unterminated address regex
我究竟做错了什么 ?
您可以使用a
在GNU-sed的命令:
sed -i.bak '/pam_env\.so$/a\
auth required pam_tally2.so onerr=fail audit silent deny=5 unlock_time=900
' /etc/pam.d/system-auth-ac
编辑:看着您发布的答案,在if/else
条件下,此awk
命令似乎比grep
和2 sed
命令更适合您:
val='auth\trequired\tpam_tally2.so onerr=fail audit silent deny=5 unlock_time=900'
awk -v val="$val" '/^auth[[:blank:]]+required[[:blank:]]+pam_env\.so/ {
print $0 RS val; next} /pam_tally2\.so/{next} 1' /etc/pam.d/system-auth-ac
auth required pam_env.so
uth required pam_tally2.so onerr=fail audit silent deny=5 unlock_time=900
auth sufficient pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 500 quiet
auth required pam_deny.so
您可以使用以下sed命令。
sed 's/^auth[[:blank:]]\+required[[:blank:]]\+pam_env\.so/&\nauth required pam_tally2.so onerr=fail audit silent deny=5 unlock_time=900' file
您的正则表达式失败是因为您要重复一个空字符类[]
零次或更多次,这毫无意义。 因此,您需要将[]*
更改为[ ]*
或<space>*
以重复零个空格或零次的空白字符。
我的脚本实际上应该是:
#! /bin/bash
grep "pam_tally2" /etc/pam.d/system-auth-ac &> /dev/null
if [ $? -ne 0 ];
then
sed -i '/^[ ]*auth[ ]*required[ ]*pam_env.so/aauth\trequired\tpam_tally2.so onerr=fail audit silent deny=5 unlock_time=900' /etc/pam.d/system-auth-ac
else
sed -i 's/.*pam_tally2.*/auth\trequired\tpam_tally2.so onerr=fail audit silent deny=5 unlock_time=900/1' /etc/pam.d/system-auth-ac
fi
工作正常!
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