I need to check if a path contains the '*' character as last digit.
My approach:
length=${#filename}
((filename--))
#use substring to get the last character
if [ ${img:$length:1} == "*"] ;then
echo "yes"
fi
This returns the [: too many arguments
error.
What am I doing wrong?
[ "${filename:$length:1}" == "*" ] && echo yes
In your post, there was no space between "*"
and ]
. This confuses bash. If a statement begins with [
, bash insists that its last argument be ]
. Without the space, the last argument is "*"]
which, after quote removal, becomes *]
which is not ]
.
Putting it all together:
length=${#filename}
((length--))
[ "${filename:$length:1}" == "*" ] && echo yes
MORE: As per the comments below, the three lines above can be simplified to:
[ "${filename: -1}" == "*" ] && echo yes
The -1
is shorthand for getting the last character. Another possibility is:
[[ $filename = *\* ]] && echo yes
This uses bash's more powerful conditional test [[
. The above sees if $filename
is matches the glob pattern *\\*
where the first star means "zero or more of any character" and the last two characters, \\*
, mean a literal star character. Thus, the above tests for whether filename ends with a literal *
. Another solution to this problem using [[
can be found in @broslow's answer.
Just use regex
if [[ "$filename" =~ '*'$ ]]; then
echo "yes"
fi
Couple of issues in your syntax.
]
${variable:${#variable}:1}
won't return any characters, ${variable:$((${#variable}-1))}
should work (note though the 1 length at the end is redundant)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.