Added correction serie2

Cours/03-Scripting/exercices/correction/serie2/getbig

+#!/usr/bin/env bash
+
+# Notes:
+# - en utilisant la récursivité
+# - introduce stat command
+# - do not compute size of folders
+# - maange empty directories
+# - hidden files should be ignored
+
+# Get the size of a link given as parameter
+function getsize {
+    stat "$1" | grep Size | cut -c9- | cut -d' ' -f1
+}
+
+# a folder is given as the unique parameter
+# finds the biggest file in this folder
+function findbig {
+    BIGSIZE=0
+
+    # If folder is empty skip it
+    CONTENT=$(ls "$1")
+    if [ -d "$1" -a -n "$CONTENT" ]; then
+
+        # For each file in the folder
+        for f in "$1"/*; do
+            # If directory find the biggest file of this directory
+            if [ -d "$f" ]; then
+                NEWSIZE=0
+                NEWFILE=$(findbig "$f")
+                if [ -n "$NEWFILE" ]; then
+                    NEWSIZE=$(getsize "$NEWFILE")
+                fi
+            # If file find the size of this file
+            else
+                NEWSIZE=$(getsize "$f")
+                NEWFILE="$f"
+            fi
+
+            # Update biggest size and file
+            if [ $NEWSIZE -gt $BIGSIZE ]; then
+                BIGFILE="$NEWFILE"
+                BIGSIZE=$NEWSIZE
+            fi
+        done
+        echo "$BIGFILE"  # return the name of the biggest file
+    fi
+}
+
+# Print usage if number / type of argument is incorrect
+if [ $# -ne 1 -o ! -d $1 ];then
+    echo "Number of argument is incorrect or parameter is not a folder" >&2
+    echo "Usage:" >&2
+    echo -e "\t$(basename $0) folder" >&2
+    exit 1
+fi
+
+# Find the biggest file and recomptue its size for display
+BIGFILE=$(findbig "$1")
+if [ -n "$BIGFILE" ]; then
+    BIGSIZE=$(getsize $BIGFILE)
+    echo -e "$BIGFILE: $BIGSIZE"
+fi
\ No newline at end of file

Cours/03-Scripting/exercices/correction/serie2/getgroups

+#!/usr/bin/env bash
+
+# A few comments:
+# - carefull that users can have the same group name than user name
+# - what happens if program is used without an argument
+# - what happens if program is used with a non existing username
+
+
+# Returns the GID of the username given in the first parameter
+function getusergid {
+    grep "^$1:" /etc/passwd | cut -d':' -f4
+}
+
+# Returns the groupname of the corresponding GID given in first parameter
+function getgroupbygid {
+    grep "^.*:x:$1" /etc/group | cut -d':' -f1
+}
+
+# Retuns the main group of a username given in parameter
+function getusergroup {
+    GID=$(getusergid $1)
+    if [ -n "$GID" ]; then
+        getgroupbygid $GID
+    fi
+}
+
+# Return all additional group names for the username given in the first parameter
+function getusergroups {
+    grep -E "(:|,)$1(,|\$|\s)" /etc/group | cut -d':' -f1
+}
+
+USER=$1
+if [ -z "$USER" ]; then
+    echo "Usage:" >&2
+    echo -e "\t$(basename $0) username" >&2
+    exit 1
+fi
+
+MGROUP=$(getusergroup $USER)
+AGROUP=$(getusergroups $USER)
+
+if [ -n "$MGROUP" -o -n "$AGROUP" ]; then
+    for G in $MGROUP $AGROUP; do
+        echo -n "$G "
+    done
+    echo ""
+fi
\ No newline at end of file