Bad substitution error when passing decremented variable to "sed" command

Jan Hus Published at Dev

Jan Hus

I like to use "sed" command to delete two consecutive lines from a file. I can delete single line using following syntax where variable "index" holds the line number:

sed -i "${index}d" "$PWD$DEBUG_DIR$DEBUG_MENU"

Since I like to delete consecutive lines I did test this syntax which supposedly decrements / increments the variable but I am getting a bad substitution error.

Addendum I am not sure where to post this , but during troubleshooting of this issue I have discovered that this syntax does not work as expected

(( index++)) nor (( index-- ))

Jan Hus

Using sed with "index" in single line deletion twice in a row / sequentially / works and resolves few issues.

#delete command line

sed -i "${index}d" "$PWD$DEBUG_DIR$DEBUG_MENU"

#delete description line

sed -i "${index}d" "$PWD$DEBUG_DIR$DEBUG_MENU"

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edited at2020-12-1

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Bad substitution error when passing decremented variable to "sed" command

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