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Bryan Dongray's(all free to download) |
| Source | Download size Last update |
Description | ||||||||||||||||||
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blksync.tgz blksync.zip perl script |
tgz:1313 zip:1346 2013-04-12 |
Block compare or sync two files | ||||||||||||||||||
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Only really useful to sync a BIG file where read is significantly faster than write (such as on USB device),
as the only changed blocks are overwritten.
Not generally useful for copying files with a very large number of differences,
as it reads both files, compares, and writes when necessary. Default is read-only mode (just reporting number of blocks different), this is useful (like a block level "cmp"). However, some people have said that: • rsync --inplace --no-whole-file <SRC> <DST>
should do the same optimized writing only what changed
(see the rsync delta-transmission algorithm),
but it turns out the rsync algorithm runs about 50% slower
than what might be considered a brute-force compare and copy (as blksync does).
But rsync is definitely faster than a copy of the entire file.Also, users on Windows machines probably don't have rsync, but may have perl. | ||||||||||||||||||||
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byte.tgz byte.zip C source |
tgz:2368 zip:2542 1995-10-18 |
Binary edit/view file | ||||||||||||||||||
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Opens a file to edit bytes in place (although can be used to append bytes). Useful for modifying/viewing a binary file. | ||||||||||||||||||||
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dayago.tgz dayago.zip perl script |
tgz:1236 zip:1270 2012-12-07 |
Find out how long ago a date was (or will be) | ||||||||||||||||||
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Converts date YYYY-MM-DD (or YYYY/MM/DD, and can handle obvious DD/MM/YY or MM/DD/YY)
into how many days ago (or "will be" as a negative number). Also given a number of days ago returns when was date was (or "will be" - if a negative number). | ||||||||||||||||||||
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dexit.tgz dexit.zip sh script & C program |
tgz:875 zip:1022 2009-06-09 |
Run command in prompted loop | ||||||||||||||||||
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Useful as a frontend to (for example) xterm,
so when the command die that is running in an xterm window,
you can still see the error - and optionally re-run it just by pressing return,
or change the command via CTRL+C.
I use it for my ssh sessions. Requires C program (provided) which runs subprocess giving back default interrupts. | ||||||||||||||||||||
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diskseek.tgz diskseek.zip C source |
tgz:1862 zip:1868 2010-07-13 |
Disk seeking/testing | ||||||||||||||||||
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Has a few different options to sequentually go from
one end of a disk (or file) to the other,
or it can start at both ends moving the offset closer to the middle,
or it can randomly skip around the disk.
The default is to go sequential, but at the start and mid-point,
ending at the mid-point and the end. By default it is also in read-only mode, use the -w option to write over your disk, but without the -n option, it will read back the data written and compare it. It does its best to be synchronous, but sometimes you need the -o option to close and open the disk after each write, especially when using raw devices. | ||||||||||||||||||||
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easter.tgz easter.zip C source |
tgz:873 zip:860 1995-12-15 |
Work out Easter day | ||||||||||||||||||
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It's been accurate every year so far. I found the algorithm in the mid 1970's, coded it in Basic on an ancient home computer, and it worked. Since then it got coded into C - as seen here. | ||||||||||||||||||||
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fakeftp.tgz fakeftp.zip sh source |
tgz:472 zip:507 2009-02-19 |
Fake FTP server | ||||||||||||||||||
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Does what you expect from an FTP server, except never logs anyone in. Useful when you need to appear like you have a working FTP server, but don't want one really! Add a xinetd.d ftp file, eg: service ftpand restart (or signal a HUP to) your xinetd. | ||||||||||||||||||||
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fields.tgz fields.zip perl source |
tgz:1266 zip:1292 2005-01-27 |
parse fields in input | ||||||||||||||||||
An input stream of the format:Identifier na=va nb=vb nc=vc ...can be trimmed down to just view named fields requested. Handles quotation on input, and provides as necessary on output. | ||||||||||||||||||||
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gethost.tgz gethost.zip perl source |
tgz:534 zip:547 2003-04-15 |
Lookup hostname or IP | ||||||||||||||||||
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A bit like "nslookup" or "dig", although much much simpler,
without any extra features,
but importantly it does not use any DNS backdoors to get its results,
it just uses standard libaries (most code does) to lookup hostnames or IPs. Output looks like a normal hosts file. Handles multiple results returned in an expected way. | ||||||||||||||||||||
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hdr.tgz hdr.zip perl source |
tgz:326 zip:331 2003-04-23 |
Show/remove email/web headers | ||||||||||||||||||
| Very simple, but useful as a pipe command to only see headers, or to strip off headers of messages. | ||||||||||||||||||||
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killtree.tgz killtree.zip perl source |
tgz:922 zip:956 2009-01-22 |
kill process and children | ||||||||||||||||||
| Kill PID, but also any children, and any children's children, etc. | ||||||||||||||||||||
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latency.tgz latency.zip C source |
tgz:3254 zip:3400 2002-09-14 |
Test network latency | ||||||||||||||||||
| Uses the "echo" port (port 7) to send (and time) a byte going to a remote host... and back. It gives a real sense of how long an interactive session (eg over ssh or a VPN) will feel like (far better than ping can). | ||||||||||||||||||||
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mkpass.tgz mkpass.zip perl source |
tgz:556 zip:554 2003-07-11 |
make crypt'd password (for UNIX and webservers) | ||||||||||||||||||
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Useful to make htpasswd files for Apache. | ||||||||||||||||||||
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parallel.tgz parallel.zip perl source |
tgz:1866 zip:2040 2008-12-16 |
Run command in parallel | ||||||||||||||||||
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Like xargs, but runs one command with each stdin line (as arg to command),
but (unlike xargs) runs those commands in parallel (as parallel as requested).
As one finishes it will start another, keeping up the parallelism. Useful for pushing files out in parallel, or running remote commands (or ping) to many remote systems (if input is list of hostnames). Useful on multi-cpu machines to run parallel compute intensive commands, on given input values. There is the -a option to allow a given number of stdin lines per parallel command. Hint: Use $PARALLELID for unique ID (eg tmp file identifier to stop parallel writing to the same output file, then cat/sort those tmp files into one)Included is a "pingall" script showing how to quickly ping all systems on your local network. Be careful with this code, you can flood your own system! | ||||||||||||||||||||
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pos.tgz pos.zip C source |
tgz:1020 zip:1175 2002-08-22 |
Find position of text in binary file | ||||||||||||||||||
| Simple text searching in any file (or raw disk), but missing "backtracking" - sorry. | ||||||||||||||||||||
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rand.tgz rand.zip perl source |
tgz:477 zip:955 2003-04-15 |
Random number | ||||||||||||||||||
| As every high school student gets to write. | ||||||||||||||||||||
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rm.tgz rm.zip C source |
tgz:4440 zip:4636 2013-06-18 |
Remove command - with secure option | ||||||||||||||||||
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There is also "srm" out there, but it has fewer options (and I wrote this one years ago). Uses your choice of Gutmann Method of a 35 pass sequence of bit patterns, or a slightly shorter version with 30 passes (without repeated random passes, and the sequence 00 to ff is reordered so that as many bits change as possible on each step ending with 00), an even shorter version with 25 passes, or just the zero file (ie 1 pass), before remove. Use very verbose mode to see each sequence being written. The passes are there to really erase a file and hide the magnetic pattern on various types of disk, but more and more passes makes it slower and slower. Note: With secure options, the files and directories are renamed, file times, permissions, and owner (if possible) are all changed multiple times to random values, which REALLY hides all details of the file you want to "shred" securely. | ||||||||||||||||||||
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sleep.tgz sleep.zip C source |
tgz:1679 zip:1676 2002-11-10 |
Fully featured sleep command | ||||||||||||||||||
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Allows the use of subsecond values,
the ability to give time in hours and minutes (and days), or combinations,
and allows to sleep to a specific time of day. So you can sleep for 1h 30m, or until 01:23:45 (without having to calculate number of seconds). It can also be told to sleep forever (without putting lots of 9's). Is compatible with normal sleep command. Update: Linux default sleep can now do most of this. | ||||||||||||||||||||
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sparse.tgz sparse.zip perl source |
tgz:1019 zip:1015 2005-04-21 |
Format columns into a table | ||||||||||||||||||
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Convert a column of pairs of values, into a table. eg
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superlative.tgz superlative.zip sh script |
tgz:427 zip:1592 2012-02-08 |
Display superlative value | ||||||||||||||||||
| Script to search given files and/or folders (recursively) for the oldest, newest, smallest or biggest. | ||||||||||||||||||||
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syncup.tgz syncup.zip perl source |
tgz:3147 zip:3142 2012-06-22 |
directory synchronization | ||||||||||||||||||
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Sync two directories by creating, copying, deleting, setting times, owner and attributes of any files, directories, and symbolic links in the destination that were added, changed, or deleted in the source tree. Perl enables the code to work for UNIX and DOS. | ||||||||||||||||||||
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thru.tgz thru.zip C source |
tgz:5421 zip:5417 2003-02-04 |
Network forwarding/listening | ||||||||||||||||||
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Written years ago, and is sort of similar to the more recent popular program "netcat",
and the very recent "socat" code. This program can listen on a port as well as send to remote port, to/from a local file or program, but can do both at the same time (a port forwarder). It can even listen on 2 ports as a strange backwards port forwarder, for those times when you want to startup a TCP connection but from the remote end (eg through a firewall). It can handle 3 (or more) way connections, but it's a bit hokey. In loop mode, it's a one port inetd. It is only TCP though. | ||||||||||||||||||||
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timeout.tgz timeout.zip C & perl source |
tgz:2065 zip:2457 2003-03-08 |
Timeout command | ||||||||||||||||||
| A way to run a command and have it stop after a specified time. I found it useful for scripted "rsh" (or ssh) commands. | ||||||||||||||||||||
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uu.tgz uu.zip perl source |
tgz:688 zip:1016 2003-07-12 |
Decode UUencoded | ||||||||||||||||||
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uuencode still exists and needs a manual way to read (or write) such a format. Also useful to encode/decode "basic encryption" of web authenication. | ||||||||||||||||||||
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wipefree.tgz wipefree.zip sh script |
tgz:804 zip:806 2003-03-08 |
Securely erase disk freespace | ||||||||||||||||||
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A script using my "rm" code (above) and creates big files
until the disk is full, and then erases them securely. End result your disk freespace is securely erased. | ||||||||||||||||||||
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x10cmd.tgz x10cmd.zip C source sh script |
tgz:2195 zip:2381 2009-12-13 |
Control X10 firecracker | ||||||||||||||||||
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Linux program (set SUID root) to control the x10 firecracker,
an RS232 serial device which can control upto 256 power outlets. Also a simple queueing system so no x10cmd commands conflict (eg if via cron, etc). |
| Dongrays → Bryan Dongray → UNIX/C/Shell/Perl/DOS tools |
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