im new in hacking, especially ctf and want to learn it... but i have a trouble here using foremost... when i tried to extract a jpg file with command foremost -v -i file.jpg
the result says its finished with extracted data. but, when i check it visually by folder, there's no results on my output folder. But, when i check it by command, ls -la i can see a file with format "00000000.png".
I listed directory information using the following command ls -lrt * > testinformat.csv.
ls command to list directory information
So this is fine but I want to transform the information in folders to show summary information like below:
ls command information
I basically want to summarize the total size into one file e.g 018 folder size to the file shown as opposed to listing all the files from step 1 above. Can one do this via bash or should I use excel?I want to automate the process. Thanks
Samantha
I have only two folders under a given directory. Is there any method to choose the second directory based on the order and not on the folder name?
Example: (I want to enter under doc2)
#ls
doc1 doc2
If you really want to use ls,
cd "$(ls -d */ | sed -n '2p')"
selects enters the second directory listed by it, independently of the number of directories provided by ls.
Parsing ls output is not a good idea generally, although it will work in most cases and will cause no harm if you are just using it in your interactive shell for fast navigation. You should not use this for serious programming.
You can use the tail command to get the last line
ls |tail -1
In ncftp tab completion only shows the differences of matched files. E.g. with the following files
file123 file125 aa
then typing ls fil will first complete to ls file12 and show
3 5
Question
Can the same be done in Bash?
BASH supports tab-completion which is fairly robust. It is implemented through bash_completion. However, be aware that the way bash_completion is configured will depend on what options are set by default by your distribution. As for its basic functionality, it is exactly as you describe for ncftp. When a partial name is entered on the command line and tab is pressed, then a list of name-matched files are displayed. Once you have entered enough characters to make the name unique, tab will complete entry of the unique filename on the command line.
Linux also provides ls, but its behavior is not the same as you describe for ncftp. ls will return the names of files and directories that match the pattern you specified. By default, the name you provide to ls is not expanded. Meaning if you have file123 and file125 in a directory and issue the command ls file, you will be greeted by the error ls: cannot access bash: No such file or directory. But providing a wildcard (filename globbing) with ls file* will return both names.
If you have additional specific questions. Just leave a comment and we will do our best to help.
Well, I'm a linux newbie, and I'm having an issue with a simple bash script.
I've got a program that adds to a log file while it's running. Over time that log file gets huge. I'd like to create a startup script which will rename and move the log file before each run, effectively creating separate log files for each run of the program. Here's what I've got so far:
pastebin
DATE=$(date +"%Y%m%d%H%M")
mv server.log logs/$DATE.log
echo program
When run, I see this:
: command not found
program
When I cd to the logs directory and run dir, I see this:
201111211437\r.log\r
What's going on? I'm assuming there's some syntax issue I'm missing, but I can't seem to figure it out.
UPDATE: Thanks to shellter's comment below, I've found the problem to be due to the fact that I'm editing the .sh file in Notepad++ in windows, and then sending via ftp to the server, where I run the file via ssh. After running dos2unix on the file, it works.
New question: How can I save the file correctly in the first place, to avoid having to perform this fix every time I resend the file?
mv server.log logs/$(date -d "today" +"%Y%m%d%H%M").log
The few lines you posted from your script look okay to me. It's probably something a bit deeper.
You need to find which line is giving you this error. Add set -xv to the top of your script. This will print out the line number and the command that's being executed to STDERR. This will help you identify where in your script you're getting this particular error.
BTW, do you have a shebang at the top of your script? When I see something like this, I normally expect its an issue with the Shebang. For example, if you had #! /bin/bash on top, but your bash interpreter is located in /usr/bin/bash, you'll see this error.
EDIT
New question: How can I save the file correctly in the first place, to avoid having to perform this fix every time I resend the file?
Two ways:
Select the Edit->EOL Conversion->Unix Format menu item when you edit a file. Once it has the correct line endings, Notepad++ will keep them.
To make sure all new files have the correct line endings, go to the Settings->Preferences menu item, and pull up the Preferences dialog box. Select the New Document/Default Directory tab. Under New Document and Format, select the Unix radio button. Click the Close button.
A single line method within bash works like this.
[some out put] >$(date "+%Y.%m.%d-%H.%M.%S").ver
will create a file with a timestamp name with ver extension.
A working file listing snap shot to a date stamp file name as follows can show it working.
find . -type f -exec ls -la {} \; | cut -d ' ' -f 6- >$(date "+%Y.%m.%d-%H.%M.%S").ver
Of course
cat somefile.log > $(date "+%Y.%m.%d-%H.%M.%S").ver
or even simpler
ls > $(date "+%Y.%m.%d-%H.%M.%S").ver
I use this command for simple rotate a file:
mv output.log `date +%F`-output.log
In local folder I have 2019-09-25-output.log
Well, it's not a direct answer to your question, but there's a tool in GNU/Linux whose job is to rotate log files on regular basis, keeping old ones zipped up to a certain limit. It's logrotate
You can write your scripts in notepad but just make sure you convert them
using this ->
$ sed -i 's/\r$//' yourscripthere
I use it all they time when I'm working in cygwin and it works. Hope this helps
First, thanks for the answers above! They lead to my solution.
I added this alias to my .bashrc file:
alias now='date +%Y-%m-%d-%H.%M.%S'
Now when I want to put a time stamp on a file such as a build log I can do this:
mvn clean install | tee build-$(now).log
and I get a file name like:
build-2021-02-04-03.12.12.log