Unable to add element to array in bash
Your problem is that the while loop runs in a subshell because it is the second command in a pipeline, so any changes made in that loop are not available after the loop exits.
You have a few options. I often use { and } for command grouping:
nm "$@" |{while read linedo …donefor j in "${array[@]}"do echo "$j"done}In bash, you can also use process substitution:
while read linedo …done < <(nm "$@")Also, it is better to use $(…) in place of back-quotes `…` (and not just because it is hard work getting back quotes into markdown text!).
Your line:
element="`echo \"$line\" | sed -n \"s/^U \([0-9a-zA-Z_]*\).*/$file:\1/p\"`"could be written:
element="$(echo "$line" | sed -n "s/^U \([0-9a-zA-Z_]*\).*/$file:\1/p")"or even:
element=$(echo "$line" | sed -n "s/^U \([0-9a-zA-Z_]*\).*/$file:\1/p")It really helps when you need them nested. For example, to list the lib directory adjacent to where gcc is found:
ls -l $(dirname $(dirname $(which gcc)))/libvs
ls -l `dirname \`dirname \\\`which gcc\\\`\``/libI know which I find easier!