Added Change passphrase / password of an existing SSH key

[grml-tips.git] / grml_tips

diff --git a/grml_tips b/grml_tips
index 3faa8d3..ac73358 100644 (file)
--- a/grml_tips
+++ b/grml_tips
@@ -584,6 +584,10 @@ Save live audio stream to file:
 or
 
 % mencoder mms://file.wmv -o $FILE -ovc copy -oac copy
+
+or
+
+% mimms mms://file.wmv
 -- 
 Merge video files:
 
@@ -659,7 +663,9 @@ to get a list of all supported trees
 -- 
 Transfer your SSH public key to another host:
 
-% ssh-copy-id -i ~/.ssh/id_dsa.pub user@remote-system
+% ssh-keygen   # if you don't have a key yet
+[...]
+% ssh-copy-id -i ~/.ssh/id_rsa.pub user@remote-system
 or
 % cat $HOME/.ssh/id_rsa.pub  | ssh user@remote-system 'cat >> .ssh/authorized_keys'
 -- 
@@ -1090,7 +1096,7 @@ Avoid all of the above steps - use grml-debootstrap(8) instead!
 -- 
 Convert files from Unicode / UTF-8 to ISO:
 
-% iconv -f utf8 -t iso-8859-15 < utffile > isofile
+% iconv -c -f utf8 -t iso-8859-15 < utffile > isofile
 
 and vice versa:
 
@@ -1274,8 +1280,7 @@ Write a Windows 2000/XP/2003 MBR to device:
 Use a Vodafone 3G Datacard (UMTS) with Linux:
 
 Plug in your vodafone card and check in syslog whether the appropriate
-(probably /dev/ttyUSB0 or /dev/noz0 when using newer vodafone cards) has
-been created. If so run:
+(probably /dev/ttyUSB0 or /dev/noz0) has been created. If so run:
 
 # gcom -d $DEVICE
 # wvdial --config /etc/wvdial.conf.umts $PROFILE
@@ -1290,8 +1295,28 @@ Usage examples:
 # gcom -d /dev/noz0
 # wvdial --config /etc/wvdial.conf.umts dreiusb
 
-Notice: newer vodafone cards require the nozomi driver. Run 'modprobe nozomi' on
-your grml system.
+If you receive invalid DNS nameservers when connecting, like:
+
+[...]
+--> primary   DNS address 10.11.12.13
+--> secondary DNS address 10.11.12.14
+
+just provide a working nameserver to resolvconf via:
+
+# echo "nameserver 80.120.17.70" | resolvconf -a ppp0
+
+Notice: some vodafone cards require the nozomi driver (run 'modprobe nozomi' on
+your grml system), some other ones require the sierra driver (run
+'modprobe sierra').
+
+If your device isn't supported by usbserial yet, manually provide vendor and
+product ID when loading the usbserial module. Usage example:
+
+% lsusb
+[...]
+Bus 004 Device 008: ID 1199:6813 Sierra Wireless, Inc.
+
+# modprobe usbserial vendor=0x1199 product=0x6813
 -- 
 hdparm - get/set hard disk parameters
 
@@ -2779,3 +2804,41 @@ Mount a cloop file:
 # modprobe cloop file=/path/to/cloop/file
 # mount -r -t iso9660 /dev/cloop /mnt/test
 -- 
+Create a PS/PDF of a plaintext file:
+
+% a2ps --medium A4dj -E -o output.ps input_file
+% ps2pdf output.ps
+-- 
+Print two pages on one in a PDF file:
+
+% pdfnup --nup 2x1 input.pdf
+
+Concatenate, extract pages/parts, encrypt/decrypt,
+compress PDFs using 'pdftk'.
+-- 
+Read a PS/PDF file on console:
+
+% pstotext file.pdf
+
+or on plain framebuffer console in graphical mode:
+
+% pdf2ps file.pdf ; ps2png file.ps file.png ; fbi file.png
+
+or
+
+% fbgs file.pdf
+-- 
+Bypass the password of a PDF file:
+
+% gs -q -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=output.pdf input.pdf -c quit
+-- 
+Record sound:
+
+% rec test.aiff
+
+This will record a AIFF audio file.
+-- 
+Change passphrase / password of an existing SSH key:
+
+% ssh-keygen -p
+--