insert line with command from one bash file to another - Stack Overflow

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I would like to inject to in docker bash file 2nd line (after #!/bin/bash -x) such a command: set -a && . .env && set +a. I've tried this inside source.sh:

TEXT_INSERT='set -a && . .env && set +a'
sed -i '1 $TEXT_INSERT' target.sh 

but it does not work. How to do it?

I would like to inject to in docker bash file 2nd line (after #!/bin/bash -x) such a command: set -a && . .env && set +a. I've tried this inside source.sh:

TEXT_INSERT='set -a && . .env && set +a'
sed -i '1 $TEXT_INSERT' target.sh 

but it does not work. How to do it?

• bash
• file
• sed
• dockerfile
• quotes

Share Improve this question Follow edited Mar 31 at 20:33 Cyrus 89.2k1515 gold badges108108 silver badges166166 bronze badges asked Mar 31 at 19:31 Ainz SamaAinz Sama 4177 bronze badges 6

• 2 Expansions only happen inside double quotes, not single quotes. That said, I'd probably avoid sed altogether here -- cat <(printf '%s\n' 'set -a && . .env && set +a') target.sh >target.sh.new && mv target.sh{.new,} does the job without requiring any nonstandard functionality (and sed -i is not standardized). – Charles Duffy Commented Mar 31 at 19:38
• 2 You're missing the sed a command to append the line. – Barmar Commented Mar 31 at 19:44
• @CharlesDuffy it works very good injecting from source.sh an exact the same line inside target.sh , but at the very beginning. – Ainz Sama Commented Mar 31 at 19:59
• @Barmar - thx, the line content sed -i "1 a $TEXT_INN " target.sh inside source.sh works fine, after ./source.sh. double quotes do the thing :) – Ainz Sama Commented Mar 31 at 20:07
• @AinzSama, yes, that cat command I gave does the same thing, injecting a first-line value (and it does it the same way sed -i does it, creating a whole new file and then renaming it over the target name). – Charles Duffy Commented Mar 31 at 21:01

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2 Answers 2

Sorted by: Reset to default 1

the `source.sh` file with content:

#!/bin/bash -x
TEXT_INN="set -a && . .env && set +a"
sed -i "1 a $TEXT_INN " target.sh

do the job

RUN $PGDATA/source.sh

with content

#!/bin/bash -x
TEXT_INN="set -a && . .env && set +a"
sed -i "2 a $TEXT_INN " /usr/local/bin/docker-entrypoint.sh

used in Dockerfile seems to override POSTGRES_USER, POSTGRES_PASSWORD, POSTGRES_DB, but I don't know where the ports set.

You could also use GNU awk to insert the desired line after the line containing #!/bin/bash :

$ awk -v text="${TEXT_INSERT}" '{if ($1 == "#!/bin/bash") {print $0 "\n" text} else {print}}' Dockerfile

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