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echo -n "##### STATIONS? #######"
read station
text="stab_site "

I need to write echo $text$station into the 27th line of text file. I used below command but it didn't work,

sed -i "27i\$text$station" text.data

it produce; $textankr ista "text" variable cannot be passed within sed function.

2 Answers 2

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That's because your shell is interpreting \$ to mean a literal (escaped) dollar sign. Try

sed -i "27i\\$text$station" text.data

or using a mix of single- and double-quotes

sed -i '27i\'"$text$station" text.data

or with a literal newline

sed -i "27i\
$text$station" text.data

(which is more POSIXly correct, I think).

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  • how can I give one space after the beginning of the written line? Dec 13, 2015 at 16:36
  • @deepblue_86 where exactly? You should be able to add a literal space anywhere in the replacement text e.g. ` $text$station` or $text $station or $text$station Dec 13, 2015 at 16:42
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Maybe the problem can be a empty output file. Example: #!/bin/bash

CAMINHO='/etc/scripts/dropbox.log'

RESULTADO=`date +%d/%m/%Y | tr '\n' ' '; dropbox status;`

sed -i "1i\
$RESULTADO" /etc/scripts/dropbox.log

This script cant write to a empty file dropbox.log.

Write some text on file and execute script again.

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  • The problem was solved with the other answer; why would it be caused by an empty output file? Jan 14, 2019 at 13:39

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