append env varable only if it is not present

shekara · 3rd October 2021, 16:57

I need to append an env variable in Path along with a semi-colon. currently, I use
${EnvVarUpdate} $0 "PATH" "A" "HKLM" '$2'. $2 has path value. it works. however, I need to add; after path value. when I do this, it keeps adding every time when running the installer. I need to add it only if it is not present. there is no overwrite option in the EnvVarUpdate library. other than using conditions, is there any methd.

Anders · 3rd October 2021, 17:29

The EnVar plug-in maybe?

shekara · 4th October 2021, 00:39

i am using plugin itself

Anders · 4th October 2021, 10:39

EnvVarUpdate is not the same as the plug-in

shekara · 5th October 2021, 02:26

will check on this...Thank you

JasonFriday13 · 7th October 2021, 11:00

If I remember correctly, EnVar strips the final semicolon off the end of the full string before it writes it. I don't know if older Windows cares if there is a semicolon on the end or not, but it works on windows 10 without a semicolon on the end.

3rd October 2021, 16:57	#1
shekara Junior Member Join Date: Oct 2020 Posts: 44	append env varable only if it is not present I need to append an env variable in Path along with a semi-colon. currently, I use ${EnvVarUpdate} $0 "PATH" "A" "HKLM" '$2'. $2 has path value. it works. however, I need to add; after path value. when I do this, it keeps adding every time when running the installer. I need to add it only if it is not present. there is no overwrite option in the EnvVarUpdate library. other than using conditions, is there any methd.

3rd October 2021, 17:29	#2
Anders Moderator Join Date: Jun 2002 Location: ${NSISDIR} Posts: 5,450	The EnVar plug-in maybe? IntOp $PostCount $PostCount + 1

4th October 2021, 10:39	#4
Anders Moderator Join Date: Jun 2002 Location: ${NSISDIR} Posts: 5,450	EnvVarUpdate is not the same as the plug-in IntOp $PostCount $PostCount + 1

7th October 2021, 11:00	#6
JasonFriday13 Major Dude Join Date: May 2005 Location: New Zealand Posts: 916	If I remember correctly, EnVar strips the final semicolon off the end of the full string before it writes it. I don't know if older Windows cares if there is a semicolon on the end or not, but it works on windows 10 without a semicolon on the end. "Only a MouseHelmet will save you from a MouseTrap" -Jason Ross (Me) NSIS 3 POSIX Ninja Wiki Profile

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4th October 2021, 00:39	#3
shekara Junior Member Join Date: Oct 2020 Posts: 44	i am using plugin itself

5th October 2021, 02:26	#5
shekara Junior Member Join Date: Oct 2020 Posts: 44	will check on this...Thank you