Question

=“”

我有一个bash脚本时，在bash中为sqlite3查询结果分配变量名称如下

#!/usr/bin/env bash
cd /Users/amar/Documents/ThesisCode/CEP_codes/mqtt-receiver

sqlite3 database <<EOF
SELECT sum(detection_time - generation_time)/count(*) from mobile_cep_data;
SELECT ((max(detection_time)- min(detection_time))*1000)/count(*) from mobile_cep_data;
EOF

它给我结果

15
12

如何获得结果

latency   = 15
thoughput = 12

Answer 1

替换

<<EOF

与

<<EOF | sed '1s/^/latency   = /;2s/^/thoughput = /'

Answer 2

@ Cyrus的答案很好，并展示了一种有用的技巧，因此我赞成它，但我想指出你也可以这样做：

sqlite3 database <<EOF
SELECT 'latency   = ',
       sum(detection_time - generation_time)/count(*) from mobile_cep_data;
SELECT 'thoughput = ',
       ((max(detection_time)- min(detection_time))*1000)/count(*) from mobile_cep_data;
EOF

当＆lt; <eof is =“”used =“”

2 个答案: