tee妙用 tee详解

tee妙用 tee详解

tee可以传递输出给管道的同时，输出到文件，我们都知道；但把输出到文件改为输出到屏幕，也是有市场需求的，如下案例
案例2（/dev/tty）：
需求，把一个命令的默认输出，显示在屏幕上的同时，传递给后面的管道命
[root@localhost ~]# cat txe 
ROR in ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./src/views/DepositList.vue
Module not found: Error: Can't resolve 'vue-ctk-date-time-picker' in '/home/ubuntu/deploy/backend/surfaces/src/views'
 @ ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./src/views/DepositList.vue 7:0-60

[root@localhost ~]# cat txe | tee /dev/tty |grep 'Error:'
ROR in ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./src/views/DepositList.vue
Module not found: Error: Can't resolve 'vue-ctk-date-time-picker' in '/home/ubuntu/deploy/backend/surfaces/src/views'
 @ ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./src/views/DepositList.vue 7:0-60
Module not found: Error: Can't resolve 'vue-ctk-date-time-picker' in '/home/ubuntu/deploy/backend/surfaces/src/views'

衍生品（技巧：if 后面直接跟命令，更高效）：
[root@localhost ~]# if cat txe | tee /dev/tty | grep 'xml';then echo ok;else echo no;fi
ROR in ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./src/views/DepositList.vue
Module not found: Error: Can't resolve 'vue-ctk-date-time-picker' in '/home/ubuntu/deploy/backend/surfaces/src/views'
 @ ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./src/views/DepositList.vue 7:0-60
 @ ./src/views/DepositList.vue
 @ ./src/router/index.js
 @ ./src/main.jld complete.
no

生产脚本（红字部分）：
#!/bin/bash
# author: royoy
cd /home/ubuntu/deploy/merchants
git pull || {
    echo "first pull failed"
    exit 3
}
wait
git checkout master || {
    echo "checkout failed"
    exit 3
}
wait
git pull || {
    echo "second pull failed"
    exit 3
}
wait
sleep 6
cd /home/ubuntu/deploy/merchants/surfaces
if npm run build | tee /dev/tty | grep 'Error:';then echo -e "\nnpm build error";exit 1;fi
cd /home/ubuntu/deploy
make merchants || {
    echo "make merchants failed"
    exit 3
}
wait
sleep 1
cd /home/ubuntu/repos 
php deployment.php merchants prod merchant
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