linux shell实现折线图代码实例

生成 100 行数据到文件 file.txt

for ((i=1; i<=100; i++));do
if [ ${i} -lt 10 ];then
num=$(( (RANDOM % 5) + 10 + i ))
else
num=$(( (RANDOM % 5) + 10 + 15 ))
fi
echo ${num}
done

通过文件 file.txt 生成折线图

#!/bin/bash

# 指定文件名，该文件必须为数字
file=\’./file.txt\’
# 指定折线图的符号
symbol=\’@\’
# 指定x轴最大长度
x_length=150
# 指定y轴高度
y_length=25

# 生成文件时需要的临时文件(不用配置)
tmp_file=\’./.tmp.txt\’
new_file=\’./.new.txt\’

# 读取文件行数，如果为0则退出，如果小于x轴长度则更新x轴长度，如果大于x轴长度则按比例只取指定的长度
file_rows=$(wc -l < ${file})
if [ ${file_rows} -eq 0 ];then
echo -e \”[ERROR] If the file is empty, exit !\”
exit 1
elif [ ${file_rows} -le ${x_length} ];then
x_length=${file_rows}
else
residue=$((file_rows / x_length))
awk \”NR % ${residue} == 0\” ${file} > ${new_file}
file=${new_file}
fi

# 获取最大值、最小值
max_number=$(awk \’NR==1 {max=$1} $1>max {max=$1} END{print max}\’ ${file})
min_number=$(awk \’NR==1 {min=$1} $1<min {min=$1} END {print min}\’ ${file})
# 获取最大行的字符数
max_char=$(awk \’NR==1 {max=length} length>max {max=length} END{print max}\’ ${file})
# 如果最大行的字符数为偶数，将第1列字符数+3,(为了避免对不齐的问题),+4是为了避免存在负数对不齐问题
[ $((max_char % 2)) -eq 0 ] && max_char=$((max_char + 3)) || max_char=$((max_char + 4))
x_symbol_length=$((x_length + max_char + 3))

# 输出第一行图表横线字符
perl -E \”say \’—\’ x ${x_symbol_length}\” >${tmp_file}

# 输出第一行说明
title=\”scatter plot\”
padding=$[(${x_length} – ${#title}) / 2]
printf \”|%-${max_char}s|%-${padding}s%s%-${padding}s|\\n\” \”unit\” \”\” \”${title}\” \”\” >>${tmp_file}
perl -E \”say \’—\’ x ${x_symbol_length}\” >>${tmp_file}

# 按指定文件的数字输出单位长度
num=${max_number}
scale=$(awk \”BEGIN{print int( (${max_number} – ${min_number}) / ${y_length} + 1)}\”)
for ((i=1; i<=y_length; i++));do
printf \”|%-${max_char}s|\\n\” \”${num}\” >>${tmp_file}
num=$(awk \”BEGIN{print int(${num} – ${scale})}\”)
done

# 横向刻划散点图
x_length=$((x_length + 1))
for ((i=1; i<=x_length; i++));do
num=${max_number}
for ((j=1; j<=y_length; j++));do
file_row=$((j+3))
file_num=$(sed -n \”${i}p\” ${file} |awk \”{print int(\\$1 / ${num})}\”)
if [[ ${i} == ${x_length} ]];then
sed_symbol=\’|\’
result=0
elif [[ ${file_num} == 1 ]];then
sed_symbol=\”${symbol}\”
result=1
else
sed_symbol=\’ \’
result=0
fi

sed -i \”${file_row}s/\\$/${sed_symbol}/\” ${tmp_file}

if [[ ${result} == 1 ]];then
if [[ ${j} == ${y_length} ]];then
continue 2
else
sed_str=\”$((file_row+1)),$((y_length+3))\”
sed -i \”${sed_str}s/\\$/ /\” ${tmp_file}
continue 2
fi
fi
num=$(awk \”BEGIN{print int(${num} – ${scale})}\”)
done
done

# 输出最后一行图表横线字符
perl -E \”say \’—\’ x ${x_symbol_length}\” >>${tmp_file}
cat ${tmp_file}

[ -f ${tmp_file} ] && rm -rf ${tmp_file}
[ -f ${new_file} ] && rm -rf ${new_file}