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Questions tagged [unix-shell]

130 questions
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Find all the sym links that point to a particular file

I know that ls -l will give you the "number of links" but I'm looking for a command or combination of commands that will give me a list of all the symbolic links that point to a particular file.
Ollie Saunders
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Get results from grep in the order they appear?

I'm trying to grep a log file to only show lines that match a certain session ID. Thus far, it works great. However, when I get the results of my grep command, I'm not getting the entries in the order they appear. If the log file in the directory…
IVR Avenger
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How to improve the efficiency of gnu parallel to read from a compressed stream?

Is another question extended from the previous one [1] I have a compressed file and stream them to feed into a python program, e.g. bzcat data.bz2 | parallel --no-notice -j16 --pipe python parse.py > result.txt The parse.py can read from stdin…
Ryan
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Unix Linux directory compare

I have a known good directory structure that I'd like to compare owner/group and permissions against another server and flag any files/folders that need to be changed. Since I wont have access to both servers at once, I'd like to script out the…
RXWatcher
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3 answers

No shell and launch application on login

I am working on migrating an application from OpenVMS to RedHat Linux 6. The application is a green screen terminal application. The users will log into Linux via SSH and the application should automatically start but they should never have access…
greyfox
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Rotatelogs rotating log files mid log entry

I have a c++ tool that outputs to STDOUT via printf i.e. printf ("%s\n", logline); I then pipe that to rotatelogs i.e. tool | rotatelogs /tmp/logs/log_%s 60 Everything works great, but rotatelogs will rotate mid line so log file 1 has this…
Brian Haines
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How to pipe and echo the result that is being processed?

I'd like to execute this command: find /apps/ -type f -print0 | grep -z log$ | xargs -0 grep 'this->aForm' And in parallel, I'd like to see which files are being processed. How to to this?
Olivier Pons
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'ls' taking a long time to list 20 subdirectories

I have a directory (my_dir) which has 20 sub directories. Every time I run 'ls' or try to autocomplete a file name in this directory my IO usage goes to 100% and it takes very long time (10 mins) to list 20 sub directories. Here is some background…
Kan
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How to find a file that contains the specified string in FreeBSD?

I'm searching for the way to find a file that contains specified string text. It should be fast as possible but its not that important. I was reading the manual, and I've build something like that: grep my_string * -r and it works at all, but if…
Cyclone
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putty aborts process while shutting down

I'm newby so the question is simple. After I connected to server via putty I want to execute some command. Suppose that command will be performed for long time (e.g. extracting files from large archive or mysql backup). Is there a way to execute a…
Eugeny89
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5 answers

Counting number of items in a single-row CSV file?

I have a file containing a long comma-delimited list of numbers, like this: 2,8,42,75,101 What's the simplest command (from a Unix shell) to get the count of numbers in this file? In the example above, that would be 5.
An̲̳̳drew
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Is there an easy way to insert data/time in front of a log file with just shell scripting?

Say I want to monitor memory usage on a java process overnight. I can do something like top | grep java > out.log I will get a log file with a whole bunch of lines. Is there an easy way to get a data/time inserted in front of each line?
James Dean
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How to concatenate environment variable paths in a cleaner way in bash?

In order to modify my paths (like LD_LIBRARY_PATH or PYTHONPATH), I first check is the variable exists. If so, I'm concatenating my old value with the new one (separated with a semicolon), else I'm settings my variable to the new…
Charles
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Picking a single line from a text file by its line number

In a Unix shell, how can I pick a single line from a text file by its line number? Say I want whatever is at line 3 in animals.txt to be written to stdout (bat bat bat). monkey monkey monkey cat cat cat bat bat bat horse horse horse Is there a…
xyz
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Will uploading modified version of a KSH script affect processes that are currently running the script?

Let say I have a KSH script my_script.ksh that performs complex operations including but not limited to invoking SQLPLUS to manipulate large number (millions) of records in an Oracle database. The script accepts a few parameters that determine which…
Lukman
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