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Full Discussion: Large Variable content size caveats?
Top Forums Shell Programming and Scripting Large Variable content size caveats? Post 303031948 by stomp on Friday 8th of March 2019 05:15:17 AM
Old 03-08-2019
Large Variable content size caveats?
Hi,

I wrote a shell script, which let me manage dns records through an api.

The raw core-command looks like about this:

Code:
output="$(curl -X GET https://mgt.myserver.de:8081/api/v1/servers/localhost/zones)"

The output contains a list of all zones with all records and is about 800 Kilobytes JSON-Data.

I ran into a first issue when I used this(incorrect) try to remove leading 000 from the 800K-variable:

Code:
# remove 000 from 
output="${output#000*}"

I think the correct term should be ${output#000}. Maybe this is an error when I typed something in without being completely aware, what I'm doing. The resulting regex caused the program did not finish this command. I assume the pattern required a huge amount of computing in that 800K-variable.

My question is:

Are there - in your experience - other general caveats, why one generally should refrain from using such big variable content sizes? As far as I read, there are no relevant size limits within linux regarding variables(for data sizes <100MB). Or would it be generally better, to use files for data at a certain limit?

Environment: Linux, bash
Last edited by stomp; 03-08-2019 at 06:31 AM..
 

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LEARN ABOUT OSF1

temporary

Temporary(4)						     Kernel Interfaces Manual						      Temporary(4)

NAME

       Temporary - Stores data files during transfers to remote systems

SYNOPSIS

       /usr/spool/uucp/SystemName/TM.xxPID.000

DESCRIPTION

       The  uucp  Temporary  (TM.*) files store data files during transfers to remote systems.	After a Data (D.*) file is transferred to a remote
       system by the uucico daemon, the uucp program places it in a subdirectory of the uucp spooling directory named  /usr/spool/uucp/SystemName,
       where  the SystemName directory is named for the computer that is transmitting the file.  The uucp program creates a temporary data file to
       hold the original data file.

       The full pathname of the temporary data file is in the following format: /usr/spool/uucp/SystemName/TM.xxPID.000

       where the SystemName directory is named for the computer that is sending the file, and TM.xxPID.000 is the name of the file;  for  example,
       TM.00451.000.  The PID variable is the process ID of the job.

FILES

       Describes accessible remote systems Contains uucp command, data, and execute files Contain data to be transferred.  Contain files that uucp
       has transferred

RELATED INFORMATION

       Daemons: uucico(8)

       Commands: uucp(1), uudemon.cleanu(4), uupick(1), uuto(1), uux(1) delim off

																      Temporary(4)
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