Tagged Questions
1
vote
2answers
130 views
BASH reading txt file and storing in array
I'm writing my first BASH script , I have some experience with c and c# so I think the logic of the program is correct..it's just the syntax is so complicated because apparently there are billions of ...
7
votes
2answers
162 views
Cleaner way to delete files on Linux which include a datestamp as part of file name
I have a new requirement to purge MySQL dump files that are older than 30 days. The files use a naming convention of "all-mysql-YYYYMMDD-HHMM.dump". The files are located on SAN mounted file system, ...
3
votes
4answers
180 views
Using GNU Parallel With Split
I'm loading a pretty gigantic file to a postgresql database. To do this I first use split in the file to get smaller files (30Gb each) and then I load each smaller file to the database using GNU ...
2
votes
2answers
140 views
Pseudo files for temporary data
I often want to feed relatively short string data (could be several lines though) to commandline programs which accept only input from files (e.g. wdiff) in a repeated fashion. Sure I can create one ...
2
votes
2answers
261 views
Check whether files in a file list exist in a certain directory
The runtime arguments are as follows: $1 is the path to the file containing the list of files
$2 is the path to the directory containing the files
What I want to do is check that each file listed in ...
9
votes
6answers
309 views
How to copy every 4th file in a folder
I have a lot of files in a folder, named like 00802_Bla_Aquarium_XXXXX.jpg. Now I need to copy every 4th file to a subfolder, saying in selected/.
00802_Bla_Aquarium_00020.jpg <= this one
...
2
votes
2answers
104 views
Sort the output of find before piping to openssh
I'm using this command to recursively generate a SHA-512 hash for each file in a directory hierarchy:
find . -type f -exec openssl sha512 {} \;
I'd like to sort the files in lexicographical order ...
4
votes
1answer
107 views
Move a file and re-target all of its symlinks [duplicate]
Possible Duplicate:
How can I “relink” a lot of broken symlinks?
Is there any way to move a file to a new location, and then re-target its symlinks to the new location, using a shell ...
1
vote
5answers
205 views
Run a command on all the files in a directory tree and put the output into a variable
I want to run this bash command :
#!/bin/bash
rep="*"
for f in `ls -R`$rep; do
d='git log '$f'| wc -l'
c=$d
echo $c
done
how to excute a command git log myFile | wc -l from bash ?
ps : this ...
3
votes
2answers
186 views
List files created on Sundays
How do I list/find all the files created on Sundays or Mondays?
How do I use the date parameter to display them?
Something like :
ls -f date + %a
or
find -type f | date +%A
or
find -type f ...
5
votes
1answer
762 views
Fast elimination of duplicate lines across multiple files
I have a huge amount of data in which each (data-)line should be unique.
There are a lot of files in one folder in which this is already true. It is about 15GB splitted into roughly 170 files with ...
0
votes
3answers
1k views
How to find executable filetypes?
I want to find file types that are executable from the kernel's point of view. As far as I know all the executable files on Linux are ELF files. Thus I tried the following:
find * | file | grep ELF
...
1
vote
0answers
108 views
Editing images with sips doesn't work without being executed directly from Terminal? [closed]
I made a cheesy application with a bash script using CocoaDialog, and within this application I need to modify the size of a photo. So, I researched a little and found the sips command; and it works ...
5
votes
7answers
807 views
Bash, remove oldest files
I`m trying to delete old files from directory and leave only 3 newest files.
cd /home/user1/test
while [ `ls -lAR | grep ^- | wc -l` < 3 ] ; do
rm `ls -t1 /home/user/test | tail -1`
...
3
votes
1answer
387 views
Replace variable read from a text file (so they can be interpreted)
I tried several stuff with not luck so maybe one of you experts can help me (I hope!).
I want to store in a text file some select statement that contain variables like a date:
$ cat res.txt
select ...
2
votes
5answers
233 views
Is it possible to reference the most recently modified file in a command line argument?
I frequently download PDF files with heinous numeric file names from my browser. These automatically go into ~/Downloads. Ideally I would like to just be able to open these files with:
evince "the ...
0
votes
2answers
906 views
How to write a file at various offsets to a filesystem partition with dd command
Requirement
I want to write a file at various offsets into the partition
Partition /dev/part2 is mounted at /mypart
I tried the command below:
dd if=/dev/urandom of=/mypart/aaa bs=1024 seek=0 ...
0
votes
2answers
1k views
How to calculate in linux number of file inside nested directories?
I need to extract information how much files are in some directory tree:
/.../testRoot/test1/test11/..../file1
/.../testRoot/test1/test11/file2
/.../testRoot/test1/test11/..../file3
...
4
votes
1answer
242 views
Renaming files from bash in linux
There is a bunch of files of the following format hh-mm-ss.png where hh, mm, ss are hour, minute and second. How can I rename all these files in the directory in a sequential way from 1.png til n.png ...
2
votes
2answers
125 views
Index names of all the files in a plain text file
I've got this directory full of images, and I can do this:
echo *.jpg
image1.jpg image2.jpg image3.jpg # and so on
How can I get the output in a plain text file in this format?
image1.jpg
...
2
votes
3answers
2k views
How to delete the oldest directory in a given directory? [duplicate]
Possible Duplicate:
Shell script for moving oldest files?
I have a backup directory that stores x other directories that require backuping.
I need something that will run before another ...
1
vote
4answers
363 views
Checking for the existence of files against a list
I have a "command" text file that issues a data file download command on each
line. I send the command file to bash. However, a small percentage of the downloads fail. Here is the algorithm I ...
3
votes
2answers
124 views
Bash - file, arrays and output
I have a file that contains employees names, departments and the cities the employee is in, something like:
John
IT
Chicago
Joshua
accounting
New York
Marcy
CEO
Los Angeles
...
I have to transform ...
17
votes
3answers
3k views
Reading lines from a file with bash: for vs. while
I'm trying to read a text file and do something with each line, using a bash script.
So, I have a list that looks like this:
server1
server2
server3
server4
I thought I could loop over this using ...
5
votes
5answers
175 views
Is there a way to see the permissions of all the intermediate directories of a path..?
I have a file path..
Is there any single command to see the file/directory permissions of all the intermediate directories in the path..?
6
votes
6answers
4k views
Shell script for moving oldest files?
How do I write a script for moving just the 20 oldest files from one folder to another? Is there a way to grab the oldest files in a folder?
11
votes
6answers
6k views
How do I can get the size of a file in a bash script?
How do I can get the size of a file in a bash script?
How do I assign this to a bash variable so I can use it later?
3
votes
2answers
95 views
Can I run a command with specific privileges on certain directories?
I would like to be able to run a command, passing in parameters to bash or similar, such that this command is not allowed to write to a particular path, overriding the user's other privs.
Eg:
...
6
votes
4answers
2k views
Number of files containing a given string
How can I count the number of files (in a directory) containing a given string as input in bash/sh?
