AIX：sed 命令删除除第一行以外的所有行的模式

Question

使用 AIX 7.X，我的 gnuplot 脚本有这些行：

set terminal png truecolor size 1950, 650  background rgb "#eff1f0" 
set output "/xxx/xxxx/xxx/xxx/xxx.png"
set datafile separator ';'

set size ratio 0.2
set bmargin at screen 0.2
unset key
set datafile separator ";"
set ylabel " MB BLOCK " font ",10" offset -1,0
set xlabel font ",10"
set xtics rotate by 45  offset -0.8,-9,-1.8


plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5

我想删除所有行的模式“plot”，除了第一行...用我的linux我这样做:

sed '0,/plot/! s/plot//g' myfile.txt

结果是：

set terminal png truecolor size 1950, 650  background rgb "#eff1f0" 
set output "/var/IBMtools/www/tim/used.png"
set datafile separator ';'

set size ratio 0.2
set bmargin at screen 0.2
unset key
set datafile separator ";"
set ylabel " MB BLOCK " font ",10" offset -1,0
set xlabel font ",10"
set xtics rotate by 45  offset -0.8,-9,-1.8


plot "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5, \ 
 "xx/xx/file.txt" using 3:xtic(1) title column(2) with linespoints linewidth 2 pointtype 7 pointsize 1.5

但是这个命令不适用于 AIX。错误是 sed: 0602-403 0,/plot/! s/plot//g is not a recognized function.

拜托，你能告诉我怎么做吗？

Answer 1

如果您可以接受 awk 解决方案，请尝试以下操作。

awk '/plot/ && ++count==1{print;next} !/plot/' Input_file

说明：为以上代码添加说明。

awk '                         ##Starting awk program from here.
/plot/ && ++count==1{         ##Checking condition if string plot is present and variable count value is 1 then do following.
  print                       ##Printing the current line.
  next                        ##next will skip all further statements from here.
}                             ##Closing BLOCK for above condition.
!/plot/                       ##Checking condition if string plot is NOT present then do print of that line.
' Input_file                  ##Mentioning Input_file name here.

注意： 如果您想将输出保存到 Input_file 本身，然后将 > temp && mv temp Input_file 附加到上面代码。

Answer 2

如果 plot 不在文件的第一行，你可以这样做：

sed '1,/plot/!s/plot//'

如果能在第一行，我看没办法只能循环：

sed ':a;/plot/!{n;ba;};:b;n;s///;bb'