RRDTool的GPRINT用printf的

Question

与此密切相关的问题格式：Bash printf prefix

我有一个生成与RRDTool的一个RRDGraph以下bash脚本。

#!/bin/bash 

now=$(date +%s) 
now_formatted=$(date +%s | awk '{printf "%s\n", strftime("%c",$1)}' | sed -e 's/:/\\:/g') 

# create power graph for last week 
/usr/bin/rrdtool graph /var/www/power-week.png \ 
--start end-7d --width 543 --height 267 --end $now-1min --slope-mode \ 
--vertical-label "Watts" --lower-limit 0 \ 
--alt-autoscale-max \ 
--title "Power: Last week vs. week before" \ 
--watermark "(©) $(date +%Y) Alyn R. Tiedtke" \ 
--font WATERMARK:8 \ 
DEF:Power=/root/currentcost/ccdata.rrd:Power:AVERAGE \ 
DEF:Power2=/root/currentcost/ccdata.rrd:Power:AVERAGE:end=$now-7d1min:start=end-7d \ 
VDEF:Last=Power,LAST \ 
VDEF:First=Power,FIRST \ 
VDEF:Min=Power,MINIMUM \ 
VDEF:Peak=Power,MAXIMUM \ 
VDEF:Average=Power,AVERAGE \ 
CDEF:kWh=Power,1000,/,168,* \ 
CDEF:Cost=kWh,.1029,* \ 
SHIFT:Power2:604800 \ 
LINE1:Power2#00CF00FF:"Last Week\\n" \ 
HRULE:Min#58FAF4:"Min " \ 
GPRINT:Power:MIN:"%6.2lf%sW" \ 
COMMENT:"\\n" \ 
LINE1:Power#005199FF:"Power " \ 
AREA:Power#00519933:"" \ 
GPRINT:Last:"%6.2lf%sW" \ 
COMMENT:"\\n" \ 
HRULE:Average#9595FF:"Average" \ 
GPRINT:Power:AVERAGE:"%6.2lf%sW" \ 
COMMENT:"\\n" \ 
HRULE:Peak#ff0000:"Peak " \ 
GPRINT:Power:MAX:"%6.2lf%sW" \ 
COMMENT:"\\n" \ 
GPRINT:kWh:AVERAGE:" total %6.2lfkWh\\n" \ 
GPRINT:Cost:AVERAGE:" cost  %6.2lf £\\n" \ 
GPRINT:Cost:AVERAGE:"$(printf \\" cost %11s\\" £%.2lf | sed 's/\£/\£ /g')\\n" \ 
COMMENT:" \\n" \ 
GPRINT:First:"Showing from %c\\n":strftime \ 
GPRINT:Last:"   to %c\\n":strftime \ 
COMMENT:" Created at $now_formatted" 

将会产生这样的曲线图（注意在图例中的较低成本的线领先\）： -

上下面的行具体浓缩： -

GPRINT:Cost:AVERAGE:"$(printf \\" cost %11s\\" £%.2lf | sed 's/\£/\£ /g')\\n" \ 

这是打印出图例中较低成本线的线。

我传递的£4.54一个GPRINT格式化值bash的printf功能对其进行填充以11位和cost标签前缀就可以了。然后，我将此管道传送到sed以在£和实际值之间添加一个空格。

我想知道的是，为什么逃出的\通过输出？如果我在printf bash抱怨缺少某些东西后立即删除\\。

我该如何在输出中抑制这个\。

Answer 1

试试这个行：

GPRINT:Cost:AVERAGE:"$(printf ' cost %11s' £%.2lf | sed 's/\£/\£ /g')\\n" \ 

我改变了内"痕'马克和删除反斜杠。