与这个问题密切相关：Bash printf prefix
我有以下使用 RRDTool 生成 RRDGraph 的 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 $now_formatted"
这会产生这样的图表（注意\图例中较低成本线上的领先）： -
具体集中在以下行：-
GPRINT:Cost:AVERAGE:"$(printf \\" cost %11s\\" £%.2lf | sed 's/\£/\£ /g')\\n" \
这是在图例中打印出较低成本线的线。
我将 GPRINT 格式的值传递£4.54给 Bash 的printf函数，以填充到 11 个空格和一个cost标签前缀。然后我通过管道将sed其添加£到实际值和实际值之间。
我想知道的是，为什么\输出中会出现转义？\\如果我在 printf bash 抱怨缺少某些东西之后删除。
我将如何抑制它\在输出中的出现。