[SOLVED] import text beatwen symbols and save as original file

end · 08-30-2017, 12:30 AM

hi

im writing script for installing arch linux. so after installing system [pacstrap] some config files need to modify and bootloader config. i whant that include in script. i try with sed but sed doesent save original file it creates another modyfy file with imported text. so what metod to use if i whant import text beatwenn "" -symbols and save original file without creating another file.

syg00 · 08-30-2017, 12:56 AM

Perhaps you haven't read the sed manpage closely enough. It usually suffices.

NevemTeve · 08-30-2017, 01:19 AM

It would be a fair challenge, if you knew for sure OP reads English well enough. Otherwise it could be better to explicitly mention option '-i'

end · 08-30-2017, 02:17 AM

thanks

actualy im following book linux command line and bible. and examples that use i option is with echo text examples, and modify file after inport text is have to save as different file. and deffinitly my english. and if you have time hove to sepify lets say to import beatwen symbol in line.

in text file lets say i have Some Text="" , and i whant to import text beatwen quotation marks.

Turbocapitalist · 08-30-2017, 02:30 AM

Quote:

Originally Posted by end

in text file lets say i have Some Text="" , and i whant to import text beatwen quotation marks.

sed is a little terse and so is the reference manual. But that also means it is simple once you get it. Try checking "man sed" on your system as you progress. Also see these guides:

Then you can try some sed program like the following:

Code:

sed -e '/Some Text/!d; s/^[^"]*"//; s/"[^"]*$//;' inputfile.txt > outputfile.txt

Can you say in more detail what you mean by importing the text between the quotes? Where do you want the text to end up, in a shell variable, a file, or somewhere else?

NevemTeve · 08-30-2017, 02:50 AM

Code:

sed -i.bak 's;keyword="old";keyword="new";' somefile.ext

end · 08-30-2017, 04:45 AM

i whant import in file in this case.

Code:

sed -i.bak 's;keyword="old";keyword="new";' somefile.ext

exacly this.

last two days im going throught book and writing evry example and now i see i dont think very much. its not that hard but thousunt things to combine i think i sleept half of book and i red first half.

and one more thing im boring i know, but same example some text="" but when beatween quotation marks there is no words or letters.

NevemTeve · 08-30-2017, 05:34 AM

That will be very surprising:

Code:

sed -i.bak 's;keyword="";keyword="new";' somefile.ext

end · 08-30-2017, 05:52 AM

yes but doesent work i try already somehove all command seems to work evry fifth time something strange.

but i found now my self basic solution i dont know way i didnt try before maybe all reading scare me about sed.

sed -i 's/""/"sometext"/' file.txt

or if need specify directory

sed -i 's/""/"some:\/"/' file.txt

thanks for help prichiated now sed is cool

Turbocapitalist · 08-30-2017, 05:58 AM

Quote:

Originally Posted by end

sed -i 's/""/"sometext"/' file.txt

That will replace all the empty quotes in the whole file with the same string, though only one per line.

Also, it is a very good idea to add a suffice for -i to use. Without a suffix, sed will overwrite the existing file and you'll have no automatic backup copy. If you have a suffix on -i then you get a backup copy automatically with the suffix as an added extension.

Maybe you can show a few lines that you want to change and then show how you would like them to look after processing.

end · 08-30-2017, 06:23 AM

you can look in grub file /etc/default/grub, on arch is at fifth line

GRUB_CMDLINE_LINUX=""

i whant to look

GRUB_CMDLINE_LINUX="crypt=/dev/sdaX:cryptroot"

can i put in sed that affect only fifth line of file he will not delete all other content.

NevemTeve · 08-30-2017, 06:33 AM

Kindly do exactly what your are told, not just something similar...

Code:

sed -i.bak 's;GRUB_CMDLINE_LINUX="";GRUB_CMDLINE_LINUX="crypt=/dev/sdaX:cryptroot";' /etc/default/grub

end · 08-30-2017, 06:44 AM

yes you are right it workink.

thanks both for help it realy help a lot to simplify this to me, and good base for rest of book.

and way i cant click post helpfull it say you need to have at least one post to rate post.

end · 08-30-2017, 07:12 AM

it was something with my browser about rate post