\u7ec3\u4e60\uff1a<\/p>\n\n\n\n
\u4f20\u9012\u4e00\u4e2a\u7528\u6237\u540d\u53c2\u6570\u7ed9\u811a\u672c\uff0c\u5224\u65ad\u6b64\u7528\u6237\u7684\u7528\u6237\u540d\u8ddf\u5176\u57fa\u672c\u7ec4\u7684\u7ec4\u540d\u662f\u5426\u4e00\u81f4\uff0c\u5e76\u5c06\u7ed3\u679c\u663e\u793a\u51fa\u6765\u3002<\/p>\n\n\n\n
18.1 \u5b57\u7b26\uff08\u4e32\uff09\u6d4b\u8bd5\uff1a<\/p>\n\n\n\n
==\uff1a\u6d4b\u8bd5\u662f\u5426\u76f8\u7b49\uff0c\u76f8\u7b49\u4e3a\u771f\uff0c\u4e0d\u7b49\u4e3a\u5047\uff08\u7b49\u53f7\u4e24\u7aef\u5fc5\u987b\u8981\u52a0\u7a7a\u683c\uff09<\/p>\n\n\n\n
!=: \u6d4b\u8bd5\u662f\u5426\u4e0d\u7b49\uff0c\u4e0d\u7b49\u4e3a\u771f\uff0c\u7b49\u4e3a\u5047<\/p>\n\n\n\n
>\uff1a\u6d4b\u8bd5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5927\u4e8e\u53e6\u5916\u4e00\u4e2a\u5b57\u7b26\u4e32<\/p>\n\n\n\n
<\uff1a\u6d4b\u8bd5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5c0f\u4e8e\u53e6\u5916\u4e00\u4e2a\u5b57\u7b26\u4e32<\/p>\n\n\n\n
-n string: \u6d4b\u8bd5\u6307\u5b9a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\uff0c\u7a7a\u5219\u771f\uff0c\u4e0d\u7a7a\u5219\u5047<\/p>\n\n\n\n
-z string: \u6d4b\u8bd5\u6307\u5b9a\u5b57\u7b26\u4e32\u662f\u5426\u4e0d\u7a7a\uff0c\u4e0d\u7a7a\u4e3a\u771f\uff0c\u7a7a\u5219\u4e3a\u5047<\/p>\n\n\n\n
[root@Daniel-R480 ~]# A=hello<\/p>\n\n\n\n
[root@Daniel-R480 ~]# B=hi<\/p>\n\n\n\n
[root@Daniel-R480 ~]# [ “$A”==”B” ]<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $?<\/p>\n\n\n\n
0<\/p>\n\n\n\n
[root@Daniel-R480 ~]# [ “$A” == “B” ]<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $?<\/p>\n\n\n\n
1<\/p>\n\n\n\n
[root@Daniel-R480 ~]# [ “$A” = “$B” ]<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $?<\/p>\n\n\n\n
1<\/p>\n\n\n\n
#\u2018\u2019\u4ee3\u8868\u7740\u76f4\u63a5\u5bf9\u6bd4A\u548cB<\/p>\n\n\n\n
[root@Daniel-R480 ~]# [ ‘$A’ = ‘$B’ ]<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $?<\/p>\n\n\n\n
1<\/p>\n\n\n\n
[root@Daniel-R480 ~]# [ “$A” = “$B” ]<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $?<\/p>\n\n\n\n
1<\/p>\n\n\n\n
[root@Daniel-R480 ~]#<\/p>\n\n\n\n
[root@Daniel-R480 ~]# [ “$A” != “$B” ]<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $?<\/p>\n\n\n\n
0<\/p>\n\n\n\n
[root@Daniel-R480 ~]#<\/p>\n\n\n\n
\u7ec3\u4e60\uff1a\u5199\u4e00\u4e2a\u811a\u672c<\/p>\n\n\n\n
\u4f20\u9012\u4e00\u4e2a\u53c2\u6570(\u5355\u5b57\u7b26\u5c31\u884c)\u7ed9\u811a\u672c\uff0c\u5982\u53c2\u6570\u4e3aq\uff0c\u5c31\u9000\u51fa\u811a\u672c\uff1b\u5426\u5219\uff0c\u5c31\u663e\u793a\u7528\u6237\u7684\u53c2\u6570\uff1b<\/p>\n\n\n\n
\u7ec3\u4e60\uff1a\u5199\u4e00\u4e2a\u811a\u672c<\/p>\n\n\n\n
\u4f20\u9012\u4e00\u4e2a\u53c2\u6570(\u5355\u5b57\u7b26\u5c31\u884c)\u7ed9\u811a\u672c\uff0c\u5982\u53c2\u6570\u4e3aq\u3001Q\u3001quit\u6216Quit\uff0c\u5c31\u9000\u51fa\u811a\u672c\uff1b\u5426\u5219\uff0c\u5c31\u663e\u793a\u7528\u6237\u7684\u53c2\u6570\uff1b<\/p>\n\n\n\n
#!\/bin\/bash<\/p>\n\n\n\n
#<\/p>\n\n\n\n
if [ $1 = ‘q’ ];then<\/p>\n\n\n\n
echo “Quiting…”<\/p>\n\n\n\n
exit 1<\/p>\n\n\n\n
elif [ $1 = ‘Q’ ];then<\/p>\n\n\n\n
echo “Quiting…”<\/p>\n\n\n\n
exit 2 <\/p>\n\n\n\n
elif [ $1 = ‘quit’ ];then<\/p>\n\n\n\n
echo “Quiting…”<\/p>\n\n\n\n
exit 3 <\/p>\n\n\n\n
elif [ $1 = ‘Quit’ ];then<\/p>\n\n\n\n
echo “Quiting…”<\/p>\n\n\n\n
exit 4 <\/p>\n\n\n\n
else<\/p>\n\n\n\n
echo $1<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
18.2 \u7ec4\u5408\u6d4b\u8bd5\u6761\u4ef6<\/p>\n\n\n\n
-a: \u4e0e\u5173\u7cfb<\/p>\n\n\n\n
-o: \u6216\u5173\u7cfb<\/p>\n\n\n\n
!\uff1a \u975e\u5173\u7cfb<\/p>\n\n\n\n
if [ $# -gt 1 -a $# -le 3 ]<\/p>\n\n\n\n
if [ $# -gt 1 ] && [ $# -le 3 ]<\/p>\n\n\n\n
q, Q, quit, Quit<\/p>\n\n\n\n
\u7ec3\u4e60\uff1a<\/p>\n\n\n\n
\u4f20\u9012\u4e09\u4e2a\u53c2\u6570\u7ed9\u811a\u672c\uff0c\u7b2c\u4e00\u4e2a\u4e3a\u6574\u6570\uff0c\u7b2c\u4e8c\u4e2a\u4e3a\u7b97\u672f\u8fd0\u7b97\u7b26\uff0c\u7b2c\u4e09\u4e2a\u4e3a\u6574\u6570\uff0c\u5c06\u8ba1\u7b97\u7ed3\u679c\u663e\u793a\u51fa\u6765\uff0c\u8981\u6c42\u4fdd\u7559\u4e24\u4f4d\u7cbe\u5ea6\u3002\u5f62\u5982\uff1a<\/p>\n\n\n\n
.\/calc.sh 5 \/ 2<\/p>\n\n\n\n
\u7ec3\u4e60\uff1a<\/p>\n\n\n\n
\u4f20\u90123\u4e2a\u53c2\u6570\u7ed9\u811a\u672c\uff0c\u53c2\u6570\u5747\u4e3a\u7528\u6237\u540d\u3002\u5c06\u6b64\u4e9b\u7528\u6237\u7684\u5e10\u53f7\u4fe1\u606f\u63d0\u53d6\u51fa\u6765\u540e\u653e\u7f6e\u4e8e\/tmp\/testusers.txt\u6587\u4ef6\u4e2d\uff0c\u5e76\u8981\u6c42\u6bcf\u4e00\u884c\u884c\u9996\u6709\u884c\u53f7\u3002<\/p>\n\n\n\n
\u5199\u4e00\u4e2a\u811a\u672c\uff1a<\/p>\n\n\n\n
\u5224\u65ad\u5f53\u524d\u4e3b\u673a\u7684CPU\u751f\u4ea7\u5546\uff0c\u5176\u4fe1\u606f\u5728\/proc\/cpuinfo\u6587\u4ef6\u4e2dvendor id\u4e00\u884c\u4e2d\u3002<\/p>\n\n\n\n
\u5982\u679c\u5176\u751f\u4ea7\u5546\u4e3aAuthenticAMD\uff0c\u5c31\u663e\u793a\u5176\u4e3aAMD\u516c\u53f8\uff1b<\/p>\n\n\n\n
\u5982\u679c\u5176\u751f\u4ea7\u5546\u4e3aGenuineIntel\uff0c\u5c31\u663e\u793a\u5176\u4e3aIntel\u516c\u53f8\uff1b<\/p>\n\n\n\n
\u5426\u5219\uff0c\u5c31\u8bf4\u5176\u4e3a\u975e\u4e3b\u6d41\u516c\u53f8\uff1b<\/p>\n\n\n\n
\u5199\u4e00\u4e2a\u811a\u672c\uff1a<\/p>\n\n\n\n
\u7ed9\u811a\u672c\u4f20\u9012\u4e09\u4e2a\u6574\u6570\uff0c\u5224\u65ad\u5176\u4e2d\u7684\u6700\u5927\u6570\u548c\u6700\u5c0f\u6570\uff0c\u5e76\u663e\u793a\u51fa\u6765\u3002<\/p>\n\n\n\n
MAX=0<\/p>\n\n\n\n
MAX -eq $1<\/p>\n\n\n\n
MAX=$1<\/p>\n\n\n\n
MAX -lt $2<\/p>\n\n\n\n
MAX=$2<\/p>\n\n\n\n
18.3 for\u5faa\u73af<\/p>\n\n\n\n
\u5faa\u73af\uff1a\u8fdb\u5165\u6761\u4ef6\uff0c\u9000\u51fa\u6761\u4ef6<\/p>\n\n\n\n
for<\/p>\n\n\n\n
while<\/p>\n\n\n\n
until<\/p>\n\n\n\n
for \u53d8\u91cf in \u5217\u8868; do<\/p>\n\n\n\n
\u5faa\u73af\u4f53<\/p>\n\n\n\n
done<\/p>\n\n\n\n
for I in 1 2 3 4 5 6 7 8 9 10; do<\/p>\n\n\n\n
\u52a0\u6cd5\u8fd0\u7b97<\/p>\n\n\n\n
done<\/p>\n\n\n\n
\u904d\u5386\u5b8c\u6210\u4e4b\u540e\uff0c\u9000\u51fa\uff1b<\/p>\n\n\n\n
\u5982\u4f55\u751f\u6210\u5217\u8868\uff1a<\/p>\n\n\n\n
\uff081\uff09{1..100}\uff1a\u76f4\u63a5\u901a\u8fc7\u6570\u5b57\u5217\u8868<\/p>\n\n\n\n
\uff082\uff09`seq [\u8d77\u59cb\u6570 [\u6b65\u8fdb\u957f\u5ea6]] \u7ed3\u675f\u6570`\uff1a\u901a\u8fc7seq\u547d\u4ee4<\/p>\n\n\n\n
[root@Daniel-R480 ~]# seq 3<\/p>\n\n\n\n
1<\/p>\n\n\n\n
2<\/p>\n\n\n\n
3<\/p>\n\n\n\n
[root@Daniel-R480 ~]# seq 5 10<\/p>\n\n\n\n
5<\/p>\n\n\n\n
6<\/p>\n\n\n\n
7<\/p>\n\n\n\n
8<\/p>\n\n\n\n
9<\/p>\n\n\n\n
10<\/p>\n\n\n\n
[root@Daniel-R480 ~]# seq 2 2 10<\/p>\n\n\n\n
2<\/p>\n\n\n\n
4<\/p>\n\n\n\n
6<\/p>\n\n\n\n
8<\/p>\n\n\n\n
10<\/p>\n\n\n\n
[root@Daniel-R480 ~]#<\/p>\n\n\n\n
#!\/bin\/bash<\/p>\n\n\n\n
#<\/p>\n\n\n\n
declare -i SUM=0<\/p>\n\n\n\n
for I in {1..100};do<\/p>\n\n\n\n
let SUM=$[$SUM+$I]<\/p>\n\n\n\n
done<\/p>\n\n\n\n
echo “The sum is : $SUM”<\/p>\n\n\n\n
1,…,100<\/p>\n\n\n\n
declare -i SUM=0<\/p>\n\n\n\n
integer<\/p>\n\n\n\n
-x<\/p>\n\n\n\n
\u5199\u4e00\u4e2a\u811a\u672c\uff1a<\/p>\n\n\n\n
1\u3001\u8bbe\u5b9a\u53d8\u91cfFILE\u7684\u503c\u4e3a\/etc\/passwd<\/p>\n\n\n\n
2\u3001\u4f9d\u6b21\u5411\/etc\/passwd\u4e2d\u7684\u6bcf\u4e2a\u7528\u6237\u95ee\u597d\uff0c\u5e76\u663e\u793a\u5bf9\u65b9\u7684shell\uff0c\u5f62\u5982\uff1a <\/p>\n\n\n\n
Hello, root, your shell: \/bin\/bash<\/p>\n\n\n\n
[root@Daniel-R480 ~]# for I in `seq 1 $LINES`; do echo “Hello, `head -n $I \/etc\/passwd | tail -1 | cut -d: -f1`”; done<\/p>\n\n\n\n
Hello, root<\/p>\n\n\n\n
Hello, bin<\/p>\n\n\n\n
Hello, daemon<\/p>\n\n\n\n
Hello, adm<\/p>\n\n\n\n
Hello, lp<\/p>\n\n\n\n
Hello, sync<\/p>\n\n\n\n
Hello, shutdown<\/p>\n\n\n\n
Hello, halt<\/p>\n\n\n\n
Hello, mail<\/p>\n\n\n\n
Hello, operator<\/p>\n\n\n\n
Hello, games<\/p>\n\n\n\n
Hello, ftp<\/p>\n\n\n\n
Hello, nobody<\/p>\n\n\n\n
Hello, systemd-network<\/p>\n\n\n\n
Hello, dbus<\/p>\n\n\n\n
Hello, polkitd<\/p>\n\n\n\n
Hello, rpc<\/p>\n\n\n\n
Hello, rpcuser<\/p>\n\n\n\n
Hello, nfsnobody<\/p>\n\n\n\n
Hello, sshd<\/p>\n\n\n\n
Hello, postfix<\/p>\n\n\n\n
Hello, chrony<\/p>\n\n\n\n
Hello, daniel<\/p>\n\n\n\n
Hello, daniel<\/p>\n\n\n\n
Hello, daniel<\/p>\n\n\n\n
Hello, daniel<\/p>\n\n\n\n
Hello, daniel<\/p>\n\n\n\n
Hello, daniel<\/p>\n\n\n\n
Hello, daniel<\/p>\n\n\n\n
3\u3001\u7edf\u8ba1\u4e00\u5171\u6709\u591a\u5c11\u4e2a\u7528\u6237<\/p>\n\n\n\n
for I in `seq 1 $LINES`; do echo “Hello, `head -n $I \/etc\/passwd | tail -1 | cut -d: -f1`”; done<\/p>\n\n\n\n
\u53ea\u5411\u9ed8\u8ba4shell\u4e3abash\u7684\u7528\u6237\u95ee\u58f0\u597d<\/p>\n\n\n\n
\u5199\u4e00\u4e2a\u811a\u672c\uff1a<\/p>\n\n\n\n
1\u3001\u6dfb\u52a010\u4e2a\u7528\u6237user1\u5230user10\uff0c\u5bc6\u7801\u540c\u7528\u6237\u540d\uff1b\u4f46\u8981\u6c42\u53ea\u6709\u7528\u6237\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\u624d\u80fd\u6dfb\u52a0\uff1b<\/p>\n\n\n\n
#!\/bin\/bash<\/p>\n\n\n\n
#<\/p>\n\n\n\n
for I in {1..10};do<\/p>\n\n\n\n
if id user$I &>\/dev\/null; then<\/p>\n\n\n\n
echo “user$I exists.”<\/p>\n\n\n\n
else<\/p>\n\n\n\n
useradd user$I<\/p>\n\n\n\n
echo user$I | passwd –stdin user$I &> \/dev\/null<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
done<\/p>\n\n\n\n
#!\/bin\/bash<\/p>\n\n\n\n
#<\/p>\n\n\n\n
for I in {1..10}; do<\/p>\n\n\n\n
if id user$I &>\/dev\/null; then<\/p>\n\n\n\n
userdel -r user$I<\/p>\n\n\n\n
echo “Delete user$I finished.”<\/p>\n\n\n\n
else<\/p>\n\n\n\n
echo “user$I not exist.”<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
done<\/p>\n\n\n\n
\u6269\u5c55\uff1a<\/p>\n\n\n\n
\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\uff1a<\/p>\n\n\n\n
add: \u6dfb\u52a0\u7528\u6237user1..user10<\/p>\n\n\n\n
del: \u5220\u9664\u7528\u6237user1..user10<\/p>\n\n\n\n
\u5176\u5b83\uff1a\u9000\u51fa<\/p>\n\n\n\n
#!\/bin\/bash<\/p>\n\n\n\n
#<\/p>\n\n\n\n
if [ $# -lt 1 ];then<\/p>\n\n\n\n
echo “Usage; adminusers –ARG”<\/p>\n\n\n\n
exit 7<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
if [ $1 == ‘–add’ ];then<\/p>\n\n\n\n
for I in {1..10}; do<\/p>\n\n\n\n
if id user$I &> \/dev\/null; then<\/p>\n\n\n\n
echo “user$I exists.”<\/p>\n\n\n\n
else<\/p>\n\n\n\n
useradd user$I<\/p>\n\n\n\n
echo user$I | passwd –stdin user$I &> \/dev\/null<\/p>\n\n\n\n
echo “Add user$I finished.”<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
done<\/p>\n\n\n\n
elif [ $1 == ‘–del’ ]; then<\/p>\n\n\n\n
for I in {1..10};do<\/p>\n\n\n\n
if id user$I &> \/dev\/null;then<\/p>\n\n\n\n
userdel -r user$I<\/p>\n\n\n\n
echo “Delete user$I finished.”<\/p>\n\n\n\n
else<\/p>\n\n\n\n
echo “No user$I.”<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
done<\/p>\n\n\n\n
else<\/p>\n\n\n\n
echo “Unknown ARG”<\/p>\n\n\n\n
exit 8<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
\u8bbe\u7f6eadminusers user1,user2,user3,hello,hi<\/p>\n\n\n\n
#!\/bin\/bash<\/p>\n\n\n\n
#<\/p>\n\n\n\n
if [ $1 == ‘–add’ ]; then<\/p>\n\n\n\n
for I in `echo $2 | sed ‘s\/,\/ \/g’`;do<\/p>\n\n\n\n
if id $I &> \/dev\/null;then<\/p>\n\n\n\n
echo “$I exists.”<\/p>\n\n\n\n
else<\/p>\n\n\n\n
useradd $I<\/p>\n\n\n\n
echo $I | passwd –stdin $I &> \/dev\/null<\/p>\n\n\n\n
echo “add $I finished.”<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
done<\/p>\n\n\n\n
elif [ $1 == ‘–del’ ]; then<\/p>\n\n\n\n
for I in `echo $2 | sed ‘s\/,\/ \/g’`;do<\/p>\n\n\n\n
if id $I &> \/dev\/null;then<\/p>\n\n\n\n
userdel -r $I<\/p>\n\n\n\n
echo “Delete $I finished.”<\/p>\n\n\n\n
else<\/p>\n\n\n\n
echo “$I NOT exist.”<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
done<\/p>\n\n\n\n
elif [ $1 == ‘–help’ ]; then<\/p>\n\n\n\n
echo “Usage:adminuser2.sh –add USER1,USER2,… | –del USER1,USER@@,…”<\/p>\n\n\n\n
else<\/p>\n\n\n\n
echo “Unknown options.”<\/p>\n\n\n\n
fi<\/p>\n\n\n\n
\u5199\u4e00\u4e2a\u811a\u672c\uff1a<\/p>\n\n\n\n
\u8ba1\u7b97100\u4ee5\u5185\u6240\u6709\u80fd\u88ab3\u6574\u9664\u7684\u6b63\u6574\u6570\u7684\u548c\uff1b<\/p>\n\n\n\n
\u53d6\u6a21\uff0c\u53d6\u4f59:%<\/p>\n\n\n\n
3%2=1<\/p>\n\n\n\n
100%55=45<\/p>\n\n\n\n
\u5199\u4e00\u4e2a\u811a\u672c\uff1a<\/p>\n\n\n\n
\u8ba1\u7b97100\u4ee5\u5185\u6240\u6709\u5947\u6570\u7684\u548c\u4ee5\u53ca\u6240\u6709\u5076\u6570\u7684\u548c\uff1b\u5206\u522b\u663e\u793a\u4e4b\uff1b<\/p>\n\n\n\n
18.4 let\u547d\u4ee4\u548c\u6570\u636e\u8ba1\u7b97<\/p>\n\n\n\n
let\u547d\u4ee4<\/p>\n\n\n\n
let I=$[$I+1]<\/p>\n\n\n\n
SUM=$[$SUM+$I]\u548clet SUM+=$I\u662f\u4e00\u4e2a\u610f\u601d<\/p>\n\n\n\n
let I+=1 \u76f8\u5f53\u4e8e let I++<\/p>\n\n\n\n
[root@Daniel-R480 ~]# I=3<\/p>\n\n\n\n
[root@Daniel-R480 ~]# let I++<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $I<\/p>\n\n\n\n
4<\/p>\n\n\n\n
[root@Daniel-R480 ~]# let I++<\/p>\n\n\n\n
[root@Daniel-R480 ~]# echo $I<\/p>\n\n\n\n
5<\/p>\n\n\n\n
-=\uff1a\u8868\u793a=-\u76f8\u5bf9\u5e94\u7684\u6570\u503c<\/p>\n\n\n\n
let I-=1 \u76f8\u5f53\u4e8e let I–<\/p>\n\n\n\n
++I, –I<\/p>\n\n\n\n
*=\uff1a\u8868\u793a=*\u76f8\u5bf9\u5e94\u7684\u6570\u503c<\/p>\n\n\n\n
\/=\uff1a\u8868\u793a=\/\u76f8\u5bf9\u5e94\u7684\u6570\u503c<\/p>\n\n\n\n
%=\uff1a\u8868\u793a=%(\u53d6\u4f59)\u76f8\u5bf9\u5e94\u7684\u6570\u503c<\/p>\n\n\n\n
\u5199\u4e00\u4e2a\u811a\u672c\uff0c<\/p>\n\n\n\n
\u5206\u522b\u663e\u793a\u5f53\u524d\u7cfb\u7edf\u4e0a\u6240\u6709\u9ed8\u8ba4shell\u4e3abash\u7684\u7528\u6237\u548c\u9ed8\u8ba4shell\u4e3a\/sbin\/nologin\u7684\u7528\u6237\uff0c\u5e76\u7edf\u8ba1\u5404\u7c7bshell\u4e0b\u7684\u7528\u6237\u603b\u6570\u3002\u663e\u793a\u7ed3\u679c\u5f62\u5982\uff1a<\/p>\n\n\n\n
BASH\uff0c3users\uff0cthey are:<\/p>\n\n\n\n
root,redhat,gentoo<\/p>\n\n\n\n
NOLOGIN, 2users, they are:<\/p>\n\n\n\n
bin,ftp<\/p>\n\n\n\n
#!\/bin\/bash<\/p>\n\n\n\n
#<\/p>\n\n\n\n
NUMBASH=`grep “bash$” \/etc\/passwd | wc -l`<\/p>\n\n\n\n
BASHUSERS=`grep “bash$” \/etc\/passwd | cut -d: -f1`<\/p>\n\n\n\n
BASHUSERS=`echo $BASHUSERS | sed ‘s@[[:space:]]@,@g’`<\/p>\n\n\n\n
echo “BASH, $NUMBASH users, they are:”<\/p>\n\n\n\n
echo “$BASHUSERS<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7ec3\u4e60\uff1a \u4f20\u9012\u4e00\u4e2a\u7528\u6237\u540d\u53c2\u6570\u7ed9\u811a\u672c\uff0c\u5224\u65ad\u6b64\u7528\u6237\u7684\u7528\u6237\u540d\u8ddf\u5176\u57fa\u672c\u7ec4\u7684\u7ec4\u540d\u662f\u5426\u4e00\u81f4\uff0c\u5e76\u5c06\u7ed3\u679c\u663e\u793a\u51fa\u6765\u3002 18.1&n […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-497","post","type-post","status-publish","format-standard","hentry","category-linux"],"aioseo_notices":[],"views":367,"_links":{"self":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=497"}],"version-history":[{"count":1,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/497\/revisions"}],"predecessor-version":[{"id":498,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=\/wp\/v2\/posts\/497\/revisions\/498"}],"wp:attachment":[{"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=497"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceansource.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}