General :: Mkdir In Bash Script - Command Substitution
Jun 26, 2010
I was to set up a cronjob that sends its output to a logfile, i want that log file to be unique. the easiest way to set this up would be to make the directory in the script, then output the command to that directory, they call that directory via is full path in cron (because cron only uses full path names.
This does not work
keep in mind the command "/bin/mkdir -p /tmp/pw_log/`date +20%y%m%d_%H%M%S`.log" works fine on the command line - but once I put it in the shell, it does not work.
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Feb 28, 2011
I have a problem with creating folders with parametr -p. I have script like: mkdir -p /dir1/dir2/dir3/dir4, but if for example /dir1/dir2 is a file, then mkdir is stoped. how to rewrite file dir2 to directory?
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Feb 5, 2010
I've written a program which creates a directory using the system call mkdir()
How can i execute 'mkdir -v' using this system call? is there another system call to include options?
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Sep 8, 2010
I just rebuilt my system from cd CentOS5.5
Went to make a dir and got this...
The command took a while to come back. I googled it but nothing came back.
Could this be hadw error? The drive is new. I was able to issue the command again and have it work.
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Aug 7, 2011
I cannot mkdir on an ancillary HDD
[Code].....
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Jul 22, 2010
I've been trying to use a find command with -exec to find the differences between identically-named files in different paths. My initial attempt was to do something like this:
Code: find trunk/ -type f -not -path '*.svn*' -exec diff '{}' `echo '{}' | sed 's/^trunk///'` ;
Unfortunately this does not work at all as expected (the diff ends up executing on the same file)! I have narrowed it down to the subshell (inside the ``) but beyond that I have no idea. For some reason the sed, though written correctly, does not perform the substitution. I've changed the diff to echo and played with the sed command and the only way I can get it to perform _any_ substitution is to use .* as the regex. Even s/.*trunk.*/SUB/ doesn't work. Any insight into the inner workings of -exec/subshells/pipes or some crap I'm missing? Don't worry about rewriting the command to make it work; I simply swapped the paths and got rid of the subshell nonsense and everything works fine.
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Jan 11, 2010
"You'll probably want to operate from inside your home directory. If your user is (for example) username, your home directory will be /home/username/. For the rest of this section we will assume you have downloaded your zip file to /home/username/src. If you do not have a src directory, you can create it with the following "mkdir" (make directory) command:"
Where do the commands go? I cant make it work in terminal. How do I get back to "home" from where i am now? example /home/mydesktop/. I am working in mydesktop. I have downloaded some packages that pkcon search will not find, but when I try to install them using "synaptic" it cant find the packages i dl. So I found this tutorial.
"So, we have our source package in /home/username/src/.
Change to the /home/username/src/ directory with the "cd" (change directory) command like so: cd /home/username/src/
but I dont know where to write the commands.
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Feb 4, 2010
Code:
This won't work in a script but it WILL work on the commandline...
Here is my output when I try the script:
Code:
Also, what is the at the end of the path in the error?
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Oct 5, 2010
The first call to "somefunction" works as expected. The function prints "endfunction" and a process in background sleeps 30 seconds. In the second call I thought it should work in the same way, but the script sleeps 30 seconds before it prints "endfunction".Does someone know the reason of this behavior? Is there another way to do a command substitution of a function that has a background process without have to waiting for that process?
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Aug 31, 2010
I am repeatedly getting error:
I need to pass the value of:
I am using #!/bin/bash
This command works on shell without any issue.
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Feb 18, 2011
I'm trying to get the substring of a string in bash. Here is the code:
Code:
#! /bin/bash
LOCAL_HOSTNAME=$(hostname)
echo $LOCAL_HOSTNAME
INDEX_OF=`expr index "$LOCAL_HOSTNAME" 1`
echo $INDEX_OF
SERVER_HOSTNAME=${LOCAL_HOSTNAME:0:INDEX_OF}
echo $SERVER_HOSTNAME
It's supposed to get the current hostname, assign it to variable LOCAL_HOSTNAME, get the first occurrence of "1" from hostname and assign value to INDEX_OF, the get the substring from variable LOCAL_HOSTNAME (starting at index 0 through INDEX_OF) and asign it to SERVER_HOSTNAME. No matter how much I've tried it keeps throwing Bad substitution error at the substring. I've searched and it says it has to be bash... but it is bash, both the sh script and the running shell. The LOCAL_HOSTNAME and INDEX_OF variables are ok.
Here is the output:
I've also tried to get the substring without the INDEX_OF but it gives the same error: SERVER_HOSTNAME=${LOCAL_HOSTNAME:0}
Code:
host1
5
test.sh: 7: Bad substitution
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Feb 17, 2011
Just a simple BASH for loop to read the file path from a text file (clean.txt) echo the variable for debug purposes, and scp it to a server I have using port 50 for SSH.
I've already formatted the entries in clean.txt to handle spaces correctly, using sed replacement.
Example from the clean.txt file:
Code:
/MP3/NAS000000001/Barenaked Ladies/Barenaked Ladies - Barenaked For The Holidays/20 Auld Lang Syne.mp3
/MP3/NAS000000001/Barenaked Ladies/Barenaked Ladies - Barenaked For The Holidays/14 Deck the Stills.mp3
[Code]....
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Nov 25, 2010
file allids consists of 300,000 rows, each containing a 5-7 digit numeric id. file newids consists of 20,000 rows of id's. How do you explain the following timings? time: 0.07s:
Code:
diff <(sort allids) <(sort newids)
time: 1.6s:
[code].....
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Mar 14, 2010
Further to solved LQ thread Bash: how to populate a list of arbitrarily named files?, what is the functional difference between feeding a loop with process substitution and feeding it with a here string with embedded command substitution? ABSG pages: process substitution, here string and command substitution. This works
Code:
while IFS= read -r -d '' file
do
files+=("$file")
done < <(find $dir -type f -print0)
[code]....
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Jun 16, 2010
I am a student studying computer science course.
Well, I am facing problem when doing lab questions.
I must use DLXLinux bundled in Bochs (bochs.sourceforge.net).
I am required to use the /usr/local directory.
In /usr directory, there is no directory named 'local' but there is one thing called 'local@'. So, when I try to use mkdir command to create 'local' directory in /usr , there are error "cannot make directory.....".
Look at my screenshot at [url].
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Jun 10, 2010
How can we fire a shell command like ls,./a.out automatically in kernel space via a kernel module ? i.e. replacement of system() function of user space into kernel space.We need to develop a kernel module which can fire some shell command let say "firefox [url]" automatically to open google automatically from module.
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Jun 15, 2010
I have the following TCL code:
if{ [catch {sqlite3 db /path/to/db/file} result] } {
puts stderr $result
} else {
do something
}
What I want is to use a variable for the file name/path. When I put in a variable instead of the absolute path, I get an error: "missing close-brace: possible unbalanced brace in comment while executing"
This is weird because when I run the code with the fully qualified pathname, it works fine. I substitute out the pathname for a variable containing the pathname ($variable) and I get this error.
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Nov 29, 2010
I create a bash script that writes another bash file. But in the generated bash file I want to write a bash command in the file and not executing it.Here's my bash file:
Code:
#!/bin/bash
cat > ~/generateGridmix2data.sh << END
[code]...
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Jul 16, 2010
I'm trying to use ${VAR:0:4} substring extraction described here: tldp.org/LDP/abs/html/string-manipulation.html and it works perfectly if i issue a command in bash. But when i put it in a script file and run it, bash gives me "bad substitution" error. Does anyone know how to fix it?
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Jun 7, 2010
Bash's command history is great, especially it is useful when adding the history -a command to the COMMAND_PROMPT.However, I'm wondering if there is a way to log the commands to a file as soon as the Return key is pressed, e.g. before starting the command and not on completion of the command (using the COMMAND_PROMPT option would save the command once the prompt is there again).
I read about auditing programs like snoopy and session recorder like script but I thought they're already too complex for the simple question I have. I guess that deactivating that script logs all the output of the command would lead already in the right direction but isn't there a quicker way to solve that probelm?
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Mar 20, 2011
Possible Duplicate: What does this cryptic bash command mean? Why this command crashes Linux? :(){ :|:& };:
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May 31, 2010
What's the command to delete bash command history?
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Jul 19, 2010
What does the mkdir -p flag do? i.e the '-p' part?
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May 25, 2010
How do I make a directory with the date in this format:
YYYYMM
201005
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Apr 19, 2010
im trying to implements mercurial repositories using ssh access.The problem is that if a login via ssh with the user "userA" all file upload vi that user are created with the owner: userA:userA and i need to use the group of the parent directory... is that posible ?For example:
repos ( root:repo)
-> project1 ( root:repoPrj1 )
-> file1 ( userA:usearA ) -> here i want userA:repoPrj1
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May 30, 2010
The setup ( although dont trust anything I say ):
I'm working on an embedded system device using a NFS mounted rootfs ( as shared by my host ) , but I store large video content directly on the device's hdd in /data.
Device's hdd partition /dev/sda3 is ext3 fs mounted at /tmp/mnt/diska3 (rw), then I have a script create dirs like /tmp/mnt/diska3/data and /tmp/mnt/diska3/data/incoming, then symlink :
ln -s /tmp/mnt/diska3/data /data so that the /data appears like any other directory.
I can see /tmp/mnt/diska3/data/incoming. I did chmod -R a+w tmp to rule out permissions.
Running a subsequent script calls mkdir: mkdir -p /data/incoming/gui
BUT fails: mkdir: cannot create directory '/data/': No such file or directory
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Jul 26, 2011
I read up on sed and I am confused about it and regular expressions. I am trying to replace some text on one line in a file with some text.
original text: $normal[''];
replaced with: $normal['localhost'];
In my script file file I've tried numerous combinations of delimiters, etc but obviously don't understand all the rules of regular expressions. My current sed command was:
sed -i 's/$normal[''];/$normal['localhost'];/g' /path_to_file
I also saw some examples using variables, so I tried that:
bb1="$normal[''];"
bb2="$normal['localhost'];"
echo $bb1
echo $bb2
sed -i 's/"$bb1"/"$bb2"/g' /path_to_file
In the above test, the echos both show the correct text but nothing happens to the real file.
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Feb 12, 2011
What does the following Shell program do ??: () { :| : &} ; :Warning: My computer got hung when i tried to execute this.Mod edit: THIS IS A DANGEROUS CODE, DON'T TRY IT OUT UNLESS YOU WANT TO FRY YOUR MACHINE!
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Mar 10, 2011
tell me what does error message signify and what should be done to rectify it...bash : lex :command not found
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Mar 10, 2011
I have following BASH script?
Code:
i=0
while [ $i -lt $ARRAYLEN ]; do
if ["$META1" = "$array"];
then
META1FLAG=1
else
META1FLAG=0
fi
let i++
done
While $array contains a word like "start"
When I run the script, In the terminal I either get the response:
myscript.sh: line 3: [: missing ']'
or if $META1 contains the same word "start, I get:
myscrit.sh: line 3: [start: command not found
The purpose of the script is to evaluate a parameter that a user might include when they invoke my script, and compare it to some data that $META1 might contain. If they match I want to set a flag and later launch Xine. If they do not match, I want to set a flag to zero and do something else. I'm a bit lost as to what the responses are trying to tell me in the terminal window when I run this script.
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