tag:blogger.com,1999:blog-61864172024-09-13T03:21:28.447+01:00A place for John to record his techy notes, both to refer back to when needed, and as a help for others...Unknownnoreply@blogger.comBlogger225125tag:blogger.com,1999:blog-6186417.post-88244507364660389092020-12-11T01:17:00.005+00:002020-12-11T01:17:54.395+00:00

Using Remote Desktop (via Citrix) to access a Windows server, and need to press Ctrl-Alt-End to send Ctrl-Alt-Del to change your password?By default, in Xfce Ctrl-Alt-End is mapped to/xfwm4/default/<Primary><Alt>End           move_window_next_workspace_keywhich stops Citrix from sending it.To undo this mapping, you can go to:Start / Settings / Settings

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-52118912957406380572020-06-19T19:06:00.000+01:002020-06-19T19:06:12.246+01:00

This is for /etc/icaclient/config/All_Regions.ini This is in: ; ; These settings control the keyboard settings ; [Virtual Channels\Keyboard] ; ; To enable alt-tab in remote machine ; https://discussions.citrix.com/topic/403094-alttab-will-not-work-on-citrix-workspace-for-linux-to-windows/ ; TransparentKeyPassthrough=Remote ; TransparentKeyPassthrough=Remote ; ; Remote losing keyboard but

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-71128530661023420052019-07-09T15:11:00.000+01:002019-07-09T15:14:15.413+01:00

Mounting an NFS filesystem from Windows on Linux. The user:group of the files was being set to nobody:nobody To override this, you can use: rw,vers=3 in your options in /etc/fstab Found this on: https://serverfault.com/questions/520276/nfs-user-mapping Using mount we could see that the mount options were defaulting to nfsv4 (which doesn't support changing the user? - it certainly doesn't

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-80480091673335343282019-02-13T12:30:00.003+00:002019-02-13T12:32:10.862+00:00

If you are running ./configure on a new download of Python and you get this: checking whether compiling and linking against OpenSSL works... no And you already have openssl installed... Make test after a build returns: Could not build the ssl module! Python requires an OpenSSL 1.0.2 or 1.1 compatible libssl with X509_VERIFY_PARAM_set1_host(). LibreSSL 2.6.4 and earlier do not provide the

Johnhttp://www.blogger.com/profile/14879927957880032034noreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-18928429473313163612019-01-24T08:54:00.000+00:002019-01-24T08:54:06.254+00:00

If cw in vim is selecting past '.' to the next whitespace or non-alpha (for which I would usually use cW) If you do set you may find: iskeyword=@,48-57,_,192-255,. If you do :set iskeyword-=.; it will remove it. NB: This is probably file-type specfic (e.g. in RedHat while editing a .sh file, but not when invoking vim with no file) If you don't want to set this globally, you can use :

Johnhttp://www.blogger.com/profile/14879927957880032034noreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-60869080963021593902018-09-17T17:24:00.000+01:002018-09-17T17:24:01.790+01:00

If you need a UUID-like string in a bash script, e.g. for the message part boundary in an email, this is probably about as simple as you can get: #!/bin/bash MD5SUM=/usr/local/gnu/bin/md5sum DATE=/usr/local/gnu/bin/date MD5=$($DATE +'%s.%N'|$MD5SUM) B1=${MD5:0:8};B2=${MD5:8:4};B3=${MD5:12:4};B4=${MD5:16:4};B5=${MD5:20:12} BOUNDARY="$B1-$B2-$B3-$B4-$B5"

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-87163906062397951872018-08-15T17:12:00.002+01:002018-08-15T17:12:49.235+01:00

lftp can nicely mirror sub directories... just do: mirror --use-pget-n=5

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-54559073724244955892018-05-30T13:55:00.001+01:002018-05-30T13:55:19.301+01:00

If you're getting /path/to/perl5/perlbrew/etc/bashrc: line 103: perlbrew: command not found Try checking to see you don't have a $HOME/.perlbrew/init file which points to an old version of perlbrew which has been deleted.

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-57640721378335419582018-05-30T12:32:00.000+01:002018-05-30T12:32:09.887+01:00

Interesting and useful history and alternatives to which command https://unix.stackexchange.com/questions/85249/why-not-use-which-what-to-use-then/85250#85250

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-31091148637537952182018-05-15T12:19:00.000+01:002018-05-15T12:22:37.764+01:00

When you have a query and you want to sort the output but the query is too complex to see what to sort on. (say your output column isn't a selected column, but rather generated data) select case when substring(t1.some_column, 1, 1) = '#' then rtrim(t1.some_column) when 'some_group' in ('group_a', 'group_b', 'group_c', 'group_d', 'group_e') then '#' + rtrim(t1.some_column)

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-63280175636946782162018-04-24T08:50:00.000+01:002018-05-15T12:24:12.100+01:00

SELECT syscolumns.name, systypes.name FROM sysobjects JOIN syscolumns ON sysobjects.id = syscolumns.id JOIN systypes ON systypes.type = syscolumns.type AND systypes.usertype = syscolumns.usertype WHERE sysobjects.name LIKE 'my_table' https://stackoverflow.com/a/28940121/224625

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-58487755330709791072017-10-31T17:56:00.000+00:002017-10-31T17:56:13.654+00:00

If you need to show the seconds (and year) in the output of ls -l on Solaris: $ ls -le /path/to/file

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-1590462645912760582016-08-26T14:06:00.004+01:002016-08-26T14:56:16.352+01:00

When you install Ardour on a fresh Debian install you will probably find that the sound isn't working. Here's what I did to get it going. sudo aptitude install ardour I also installed these. sudo aptitude install Qtractor sudo aptitude install audacity I installed these 2 to convert mp3s to ogg so I could import them. Qtractor lets you import mp3 but ardour doesn't sudo aptitude

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-19268374174780229702016-02-02T12:56:00.000+00:002016-09-06T17:11:05.764+01:00

I like MobaXterm http://mobaxterm.mobatek.net/ I like 7-Zip http://p7zip.sourceforge.net/ (In my previous version of this How-To I used 7-Zip for Windows from http://www.7-zip.org/ ) to open the downloaded archive, but now you can do it all from within mobaxterm. To get 7-Zip working in MobaXterm I downloaded the 7-Zip package from a cygwin mirror... (find your closest one at https://

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-33093329789982882862014-08-13T09:48:00.001+01:002014-08-13T09:50:00.914+01:00

In /var/adm/messages on Solaris: Aug 13 02:30:16 hostname adm: [ID 702911 daemon.notice] Aug 13 02:30:16 hostname last message repeated 4 times Aug 13 02:30:16 hostname adm: [ID 702911 daemon.notice] ********** SYSTEM ACCOUNTING STARTED Wed Aug 13 02:30:16 BST 2014 ********** Aug 13 02:30:16 hostname adm: [ID 702911 daemon.notice] Aug 13 02:30:16 hostname last message repeated 4 times Aug 13

Johnhttp://www.blogger.com/profile/14879927957880032034noreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-16313325677596033502014-07-17T17:00:00.002+01:002014-07-17T17:02:30.290+01:00

e.g.: mv file_abc.jpg pic.XX.jpg mv random.jpg pic.XX.jpg mv other.jpg pic.XX.jpg mv name.jpg pic.XX.jpg If you do this: :%s/XX/\=line(".")/

Johnhttp://www.blogger.com/profile/14879927957880032034noreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-70683929340449748862014-07-01T00:12:00.005+01:002014-07-01T00:12:52.654+01:00

Make SSH ignore your SSH key, not prompt for a passphrase, only use password: $ ssh -o PreferredAuthentications=keyboard-interactive -o PubkeyAuthentication=no destination.host

Johnhttp://www.blogger.com/profile/14879927957880032034noreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-78917045337281867002014-05-28T12:07:00.000+01:002014-05-28T12:12:46.361+01:00

Find files that are not world readable and make them readable: sudo find . -type f \! -perm -4 -exec chmod o+r {} + Find files that are not group readable find . -type f \! -perm -40 -ls Find files that are group writable find . -type f -perm -20 -ls Find files that are world writable find . -type f -perm -2 -ls

Johnhttp://www.blogger.com/profile/14879927957880032034noreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-5014027349895326462014-05-14T19:11:00.001+01:002014-05-28T12:10:58.768+01:00

If the file /usr/sbin/virtinfo exists, run: $ /usr/sbin/virtinfo -a If you run it as root it will also tell you the hostname of the Control domain and the Chassis serial#.

Johnhttp://www.blogger.com/profile/14879927957880032034noreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-28621399256947634272013-11-14T17:03:00.001+00:002013-11-14T17:04:28.753+00:00

ls | paste -s -d'%' - | sed 's/\(^\|$\)/"/g;s/%/","/g'

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-89312758891637957712013-10-11T17:22:00.003+01:002013-11-14T16:57:01.629+00:00

( printf "GET /path/to/file HTTP/1.0\n\n" 1>&0 ; cat ) 0<> /dev/tcp/<HOSTNAME>/80 Thanks David!

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-60446604931040588542013-08-13T16:41:00.001+01:002013-08-13T18:03:51.516+01:00

You can tell it's likely to be a Windows box by what ports it has open... "The target host OS can often be guessed simply by looking at the ports which are open. Microsoft Windows machines often have TCP ports 135 and 139 open. Windows 2000 and newer also listen on port 445." ( from: http://nmap.org/book/osdetect-other-methods.html ) Once you've identified it's a Windows host, how can you tell

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-9249687085554329602013-08-06T12:11:00.000+01:002013-08-06T12:11:38.268+01:00

To find out how much swap processes are using... On Solaris: ps -eo vsz,rss,pid,args | sort -n top -b -o size Total swap used by pid pmap -S $PID | tail -1 | awk '{print $4}' 20236 Don't really want to use these: prstat -s rss prstat -s size Size: total virtual memory size of the process, including all mapped files and devices. RSS: should be the resident set size, but

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-48427122816446051012013-07-08T13:19:00.003+01:002013-07-08T13:21:16.480+01:00

cd repository git log --pretty=email --patch-with-stat --reverse -- path/to/file_or_folder > ../patch cd ../other_repository git am < ../patch

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6186417.post-14327641361415955492013-05-02T17:48:00.002+01:002013-05-02T17:52:34.703+01:00

Ever missed seq on a non-gnu system (like older Solaris)? Here's an extremely portable alternative which turns out to be much more efficient too! yes '' | head -100000 | cat -n Phil explained that the efficiency is to do with the way that cat does its line numbering (by incrementing the ASCII characters rather than counting numbers and converting them to characters) Thanks Phil!

Unknownnoreply@blogger.com0