--- Begin Message ---
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Subject: |
bug "cut of end-line is skipped" |
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Date: |
Thu, 29 May 2014 23:43:25 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
helo, i'm a bash shell script beginner...
forgive my poor English, i'd like to contribute to GNU O.S. reporting
this suspect bug.
it was working perfectly the command from
ubuntu 12.04 LTS after installed "at" using the terminal command apt-get
install at
#################################
echo "`atq`" |cut -d$'\n' -f1 | cut -d$'\t' -f1
#################################
return the first number job id from the scheduler atq Job list.
exaple: 9432 or 9486 or ... 9498
it was working perfectly the follow routine from my implementation for
video surveillance in shell script running like root user:
##################################
##################################
#! /bin/sh
#
Kill_All_Jobs()
{
local Job_Pid=""
local Done=false
local Empty=""
while [ "$Done" = false ]
do
Job_Pid=""
# set first line
Job_Pid=$( echo "`atq`" |cut -d$'\n' -f1 )
# set first field
Job_Pid=$( echo "$Job_Pid" | cut -d$'\t' -f1 )
if [ "$Job_Pid" != "$Empty" ]
then
echo "KILLING JOB $Job_Pid"
at -r "$Job_Pid"
echo ""
sleep 1
else
Done=true
fi
done
}
##################################
##################################
Now after Upgrade to ubuntu 14.04 LTS
the command
#################################
echo "`atq`" |cut -d$'\n' -f1 | cut -d$'\t' -f1
#################################
give to a different output result!
example output is
94234
94356
94237
in the same bash variable..
i hope mistake, i think the cut of tabulator is done but the cut of
end-line is skipped!
so the result is a set of values that make the routine in loop .. the at
-r command can't operate without a correct parameter variable value.
after some time.. i replaced the routine using a rea-file-line
instruction and temporarily solved
##################################
Kill_All_Jobs()
{
local Job_Pid=""
local Done=false
local Empty=""
local Temp_location="$VS_ROOT"
local Temp_name="atq.sh"
local Tmp_File="$Temp_location$Temp_name"
local line=""
while [ "$Done" = false ]
do
atq > "$Tmp_File"
Job_Pid=""
line=""
while read line
do
#set first filed
Job_Pid=$( echo "$line" | cut -d$'\t' -f1 )
echo "line..$line..$Job_Pid.."
done < "$Tmp_File"
if [ "$Job_Pid" != "$Empty" ]
then
echo "KILLING JOB ..$Job_Pid.."
at -r "$Job_Pid"
echo ""
sleep 1
else
Done=true
fi
done
kill "$Tmp_File"
}
##################################
good rule of developing is avoid to use files not necessary...
so i'd like to have reply from the follow questions:
1- what is the correct syntax to use cut with atq command to extract the
job id?
2- the output from shell commands use the same field separator and line
separator?
3- there is a standar output format or metod from shell commands?
thanks regard ... rudy
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--- Begin Message ---
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Subject: |
Re: bug#17637: bug "cut of end-line is skipped" |
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Date: |
Sun, 01 Jun 2014 13:50:20 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
tags 17637 - notabug
On 05/30/2014 06:43 PM, Pádraig Brady wrote:
> Arguments for reverting to old behavior:
> compat for coreutils only scripts
> compat with existing i18n patch in various distros
> Valid use cases albeit achievable with other utils
>
> Arguments for keeping new behavior
> avoids users introducing unneeded GNU extensions to scripts
> avoids special casing last '\n' in file
> allows for more efficient implementation
>
> Compat concerns win here I think so
> I'm 55:45 in favor of applying the attached patch
> to reinstate the functionality.
Pushed.
thanks,
Pádraig.
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