How do I get the path of a process in Unix / Linux

Question

In Windows environment there is an API to obtain the path which is running a process. Is there something similar in Unix / Linux?

Or is there some other way to do th

Answer 1

thanks : Kiwy
with AIX:

getPathByPid()
{
    if [[ -e /proc/$1/object/a.out ]]; then
        inode=`ls -i /proc/$1/object/a.out 2>/dev/null | awk '{print $1}'`
        if [[ $? -eq 0 ]]; then
            strnode=${inode}"$"
            strNum=`ls -li /proc/$1/object/ 2>/dev/null | grep $strnode | awk '{print $NF}' | grep "[0-9]\{1,\}\.[0-9]\{1,\}\."`
            if [[ $? -eq 0 ]]; then
                # jfs2.10.6.5869
                n1=`echo $strNum|awk -F"." '{print $2}'`
                n2=`echo $strNum|awk -F"." '{print $3}'`
                # brw-rw----    1 root     system       10,  6 Aug 23 2013  hd9var
                strexp="^b.*"$n1,"[[:space:]]\{1,\}"$n2"[[:space:]]\{1,\}.*$"   # "^b.*10, \{1,\}5 \{1,\}.*$"
                strdf=`ls -l /dev/ | grep $strexp | awk '{print $NF}'`
                if [[ $? -eq 0 ]]; then
                    strMpath=`df | grep $strdf | awk '{print $NF}'`
                    if [[ $? -eq 0 ]]; then
                        find $strMpath -inum $inode 2>/dev/null
                        if [[ $? -eq 0 ]]; then
                            return 0
                        fi
                    fi
                fi
            fi
        fi
    fi
    return 1
}