From 8b2c38eceb3a35551912ad0516c3ad613f7987bf Mon Sep 17 00:00:00 2001
From: Florent Gluck <florent.gluck@hesge.ch>
Date: Wed, 16 Apr 2025 15:24:53 +0200
Subject: [PATCH] Added correction serie2
---
.../exercices/correction/{ => serie1}/convimg | 0
.../exercices/correction/{ => serie1}/sigproc | 0
.../exercices/correction/serie2/getbig | 62 +++++++++++++++++++
.../exercices/correction/serie2/getgroups | 47 ++++++++++++++
4 files changed, 109 insertions(+)
rename Cours/03-Scripting/exercices/correction/{ => serie1}/convimg (100%)
rename Cours/03-Scripting/exercices/correction/{ => serie1}/sigproc (100%)
create mode 100755 Cours/03-Scripting/exercices/correction/serie2/getbig
create mode 100755 Cours/03-Scripting/exercices/correction/serie2/getgroups
diff --git a/Cours/03-Scripting/exercices/correction/convimg b/Cours/03-Scripting/exercices/correction/serie1/convimg
similarity index 100%
rename from Cours/03-Scripting/exercices/correction/convimg
rename to Cours/03-Scripting/exercices/correction/serie1/convimg
diff --git a/Cours/03-Scripting/exercices/correction/sigproc b/Cours/03-Scripting/exercices/correction/serie1/sigproc
similarity index 100%
rename from Cours/03-Scripting/exercices/correction/sigproc
rename to Cours/03-Scripting/exercices/correction/serie1/sigproc
diff --git a/Cours/03-Scripting/exercices/correction/serie2/getbig b/Cours/03-Scripting/exercices/correction/serie2/getbig
new file mode 100755
index 0000000..6985048
--- /dev/null
+++ b/Cours/03-Scripting/exercices/correction/serie2/getbig
@@ -0,0 +1,62 @@
+#!/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
diff --git a/Cours/03-Scripting/exercices/correction/serie2/getgroups b/Cours/03-Scripting/exercices/correction/serie2/getgroups
new file mode 100755
index 0000000..9aa41ae
--- /dev/null
+++ b/Cours/03-Scripting/exercices/correction/serie2/getgroups
@@ -0,0 +1,47 @@
+#!/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
--
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