My problem is that I read a file and got array of strings, but each my string has spaces in the end, I need to remove it. Each line has different numbers of spaces. How can I do this?
Right now I can delete all spaces from each string, it looks like:
My code:
index=0 while read name; do get_user_group_from_file[$index]="${name//[[:space:]]/}" index=$(($index+1)) done < "${FILE}" The problem with your approach is the parameter expansion code removes all spaces from a given input line. For e.g. see
str='line has spaces' echo "${str//[[:space:]]/}" linehasspaces To remove only the last one, use a different construct with bash provides with extglob
str='line has 4 spaces last ' echo "${str%%+([[:space:]])}" So your whole script should look like
#!/usr/bin/env bash shopt -s extglob while read -r name; do get_user_group_from_file[$index]="${name%%+([[:space:]])}" index=$(($index+1)) done < "${FILE}" 
index=$(($index+1)) can be written as ((index++)).You can output the file with removed trailing spaces like this:
sed 's/[[:space:]]*$//' "$file" example:
> echo "123 " > file > echo "+$(cat file)+" +123 + > echo "+$(sed 's/[[:space:]]*$//' file)+" +123+ and another example:
> echo "123 " > file > echo "+$(cat file)+" +123 + > sed -i -e 's/[[:space:]]*$//' file > echo "+$(cat file)+" +123+ or remove it from a string saved in a variable:
sed 's/[[:space:]]*$//' <<<"$line" example:
> string="alallal "; > string=$(sed 's/[ ]*$//' <<<"$string") > echo "+${string}+" +alallal+ The [[:space:]]* matches one or more whitespaces characters (tabs, spaces). If you want only spaces, replace that with just [ ]*. The $ is used to indicate end of line.
To get count of lines in file, use wc -l:
index=$(wc -l < "$FILE") Note that:
while read name by iteself removes trailing and leading whitespace characters. Also allows backslash to escape characters. Use:
while IFS= read -r name More about that topic can be found here.
To read a file into an array without trailing whitespaces, use:
mapfile -t get_user_group_from_file < <(sed 's/[[:space:]]*$//' file) 
while read name removes trailing newlines, don't know what you want to do.I believe you just need to change a line there
get_user_group_from_file[$index]="${name// *$/}" 