Beispiele 30.10.2024

20241030/dbs-20241030.txt

+Bilder unter Linux ausführbar machen:
+https://djharper.dev/post/2020/12/26/executable-pngs/

20241030/scripts-02.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> ls -l test.jpg
+-rwxr-xr-x 1 peter peter 26 30. Okt 11:26 test.jpg
+cassini/home/peter/bo/2024ws/dbs/20241030> cat test.jpg
+#!/usr/bin/bc
+
+2 + 2
+quit
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test.jpg
+bc 1.07.1
+Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
+This is free software with ABSOLUTELY NO WARRANTY.
+For details type `warranty'.
+4
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/scripts-03.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> ls -l test.jpg
+-rwxr-xr-x 1 peter peter 26 30. Okt 11:26 test.jpg
+cassini/home/peter/bo/2024ws/dbs/20241030> cat test.jpg
+#!/usr/bin/bc
+
+2 + 2
+quit
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test.jpg
+bc 1.07.1
+Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
+This is free software with ABSOLUTELY NO WARRANTY.
+For details type `warranty'.
+4
+cassini/home/peter/bo/2024ws/dbs/20241030> cat >> scripts-02.txt
+cassini/home/peter/bo/2024ws/dbs/20241030> ls -l test.jpg
+-rwxr-xr-x 1 peter peter 26 30. Okt 11:26 test.jpg
+cassini/home/peter/bo/2024ws/dbs/20241030> cat test.jpg
+#!/usr/bin/bc
+
+2 + 2
+quit
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test.jpg
+bc 1.07.1
+Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
+This is free software with ABSOLUTELY NO WARRANTY.
+For details type `warranty'.
+4
+cassini/home/peter/bo/2024ws/dbs/20241030>
+cassini/home/peter/bo/2024ws/dbs/20241030> feh test.jpg
+feh WARNING: test.jpg - No Imlib2 loader for that file format
+feh: No loadable images specified.
+See 'man feh' for detailed usage information
+cassini/home/peter/bo/2024ws/dbs/20241030> display test.jpg
+display-im6.q16: insufficient image data in file `test.jpg' @ error/jpeg.c/ReadJPEGImage_/1166.

20241030/scripts-04.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> ls -l test.pbm
+-rwxr-xr-x 1 peter peter 75 30. Okt 11:30 test.pbm
+cassini/home/peter/bo/2024ws/dbs/20241030> cat test.pbm
+P4
+# Created by GIMP version 2.10.34 PNM plug-in
+10 10
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test.pbm
+./test.pbm: Zeile 1: P4: Kommando nicht gefunden.
+./test.pbm: Zeile 3: 10: Kommando nicht gefunden.
+./test.pbm: Zeile 4: $'\022\022\022\200@@\200?': Kommando nicht gefunden.
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/scripts-05.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> cat test.c
+/*/true; echo "Hallo, Welt!"; exit 0; */
+
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  return 0;
+}
+cassini/home/peter/bo/2024ws/dbs/20241030> chmod +x test.c
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test.c
+Hallo, Welt!
+cassini/home/peter/bo/2024ws/dbs/20241030> gcc -Wall -O test.c -o test
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test
+Hello, world!
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/scripts-06.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> cat test2.c
+/*/true
+
+echo "Hallo, Welt!"
+exit 0
+
+*/
+
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  return 0;
+}
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test2.c
+Hallo, Welt!
+cassini/home/peter/bo/2024ws/dbs/20241030> gcc -Wall -O test2.c -o test2
+cassini/home/peter/bo/2024ws/dbs/20241030> ./test2
+Hello, world!
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/scripts-07.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> true
+cassini/home/peter/bo/2024ws/dbs/20241030> echo $?
+0
+cassini/home/peter/bo/2024ws/dbs/20241030> false
+cassini/home/peter/bo/2024ws/dbs/20241030> echo $?
+1
+cassini/home/peter/bo/2024ws/dbs/20241030>

20241030/test.c

+/*/true; echo "Hallo, Welt!"; exit 0; */
+
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  return 0;
+}

20241030/test.jpg

+#!/usr/bin/bc
+
+2 + 2
+quit

20241030/test2.c

+/*/true
+
+echo "Hallo, Welt!"
+exit 0
+
+*/
+
+#include <stdio.h>
+
+int main (void)
+{
+  printf ("Hello, world!\n");
+  return 0;
+}

20241030/wildcards-01.txt

+cassini/home/peter/bo/2024ws/dbs/20241030> cp -pi test{,2}.c
+cassini/home/peter/bo/2024ws/dbs/20241030> echo cp -pi test{,2}.c
+cp -pi test.c test2.c
+cassini/home/peter/bo/2024ws/dbs/20241030>