shell笔记

1. awk使用，取出df中大于50%的文件系统

我编了一个文件如下：

root@wis-virtual-machine:/wis/testdir1# cat df.txt 
Filesystem      Size  Used Avail Use% Mounted on
udev            482M     0  482M   0% /dev
tmpfs           100M  5.5M   95M  70% /run
/dev/sda1       19G  8.3G  9.4G   48% /
/dev/mapper/vgw_lv_name
                19G  8.3G  9.4G   58% /wis

　　想把大于50%的文件系统输出，了如下代码：

root@wis-virtual-machine:/wis/testdir1# cat df.txt |awk 'BEGIN{limit=50}NR==1{print}NF==1{lvname=$1}NF==6{if($5+0>limit)print}NF==5{if($4+0>limit)print lvname"
"$0}' 
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           100M  5.5M   95M  70% /run
/dev/mapper/vgw_lv_name
                19G  8.3G  9.4G   58% /wis

　　这里主要是用（$5+0）把70%这样的字符串改成整数的。

2. telnet自动登录：

(sleep 1;echo username;sleep 1;echo password; sleep 1;echo cmd;sleep 1;)|telnet hostname

　　3. 两个文件按列合并

paste

 　　4. 主机名取最后一位数字

echo ${HOSTNAME##*-}
ansible beijing-114 -m shell -a "/tmp/net.sh ${HOSTNAME##*-} eth0 eth2" -f 100

       5. find正则

find /opt/mydata -mtime +3 -type d -regextype sed -regex "/opt/my_data/[0-9]*"

  6. keepalived钉钉告警

cat /etc/keepalived/keepalived.conf |tail -5
  notify_master "/etc/keepalived/keepalived_notify.sh master"
  notify_backup "/etc/keepalived/keepalived_notify.sh backup"
  notify_fault "/etc/keepalived/keepalived_notify.sh fault"
  notify_stop "/etc/keepalived/keepalived_notify.sh stop"

cat /etc/keepalived/keepalived_notify.sh
#!/bin/bash
curl "https://oapi.dingtalk.com/robot/send?access_token=token" -H "Accept: application/json" -H "Content-Type:application/json" --data @<(cat <<EOF
{
        "msgtype": "text",
        "text": {
            "content": "$HOSTNAME:$1"
        }
  }
EOF
)

   7. mac sed 替换

sed -i '' -e  's/old/new/g' *

   8. 我写的最长的 awk

for file in /ops/*log
do
cat <<EOF | curl --data-binary @- http://192.168.56.11:9091/metrics/job/firewall/instance/$(echo $file|sed 's@/ops/@@g'|sed 's@.log@@g')
$(awk 'BEGIN{print "# TYPE snat_rule gauge";print "# TYPE snat_rule_max gauge";print "# TYPE snat_rule_current gauge"}/snat/{snat_id=$NF}{}{sub(/ports:/,"")} /%/{gsub("id:", "", snat_id);printf "snat_rule{id="%s",protocol="%s"} %s
",snat_id,$1,$2;gsub("\(", "", $3);gsub(/[ 	]+$/,"", $3); printf "snat_rule_max{id="%s",protocol="%s"} %s
",snat_id,$1,$5;  printf "snat_rule_current{id="%s",protocol="%s"} %s
",snat_id,$1,$3}' $file  |sed 's@/ops/@@g'|sed 's@.log@@g' |sed 's@%@@g' )
EOF
done

  9. kubernetes 配置 PS1 使其显示当前集群和命令空间

tail .zshrc

export PS1='%{$fg[magenta]%}%n@%{$fg[magenta]%}%m%{$reset_color%} %{$fg[blue]%}% $cluster:$(grep namespace $KUBECONFIG|cut -d":" -f 2) $PWD~%{$reset_color%}$'

alias aliqak8s01="export KUBECONFIG=~/.kube/config && cluster=aliqak8s01"

alias tengxunk8s02="export KUBECONFIG=~/.kube/tengxunk8s02 && cluster=tengxunk8s02"
alias tengxunk8s01="export KUBECONFIG=~/.kube/tengxunk8s01 && cluster=tengxunk8s01"

aliqak8s01