You can simplify your loops by controlling the special IFS variable. The shell itself can be told to split on newlines and only newlines, or on commas, or quotes, or whatever.
Also, some of those echoes look redundant.
...and most of those \n's in your code aren't real newlines:
So I suspect a lot of your code isn't doing what you think it is.
Last edited by Corona688; 08-29-2019 at 02:49 PM..
I am piping STDOUT from commands such as ifconfig and dmesg through grep, sed and awk to get the information I need.
I need to now perform some looping and branching now and have been trying to figure out how to do this on the command line.
You may ask "Why the command line? - Why not put it... (2 Replies)
hi,
my first question is :-
i would like to know how do i loop through the output of a variable.
for ex:- if i have a variable called x and echo $x gives the output like
feb 19 07
feb 20 07
feb 21 07
i would like to know how do i loop through this since it is separated and i... (1 Reply)
I have a csh that is called from autosys. It fails when it hits this code
env | grep Rep
if ( $status == 0 ) then
echo ""
else
setenv REP ""
endif
However if I run it from the command line, as opposed to from autosys (job schduler) it runs fine. I thought it might be some kind of... (2 Replies)
Dear all,
I have a text file like below.
eg.txt
abcd
efgh
ijkl
mnop
I need a script, which should read the text file eg.txt and assign each line as a parameter. This , i wil use further to pass it a java command to invoke. All inside a for loop
Need your help on this.
With... (2 Replies)
I have a .csv file and i use the below while loop to navigate through it
But i need to loop from the second line since the first line is the header
How will i do it?? please help
while IFS=, read Filename Path size readonly
do
echo "Filename -> ${Filename}"
echo "Path -> ${Path}"
echo... (8 Replies)
I have been trying this program for a long time. I am trying to read a file named "odon" line by line; read the first line, send it to do a command saved in a file "perm", once the first line has finished going through the content of the file perm, the result is saved with the number of the line.... (17 Replies)
I am working with a sh script on a solaris 9 zone (sol 10 host) that grabs information to build the configuration command line. the variables Build64, SSLopt, CONFIGopt, and CC are populated in the script. the script includes
CC=`which gcc`
CONFIGopt=' --prefix=/ --exec-prefix=/usr... (8 Replies)
This works when I try to execute normally :
echo | format | nawk '/pci@1f,4000/{print x}; {x=$0 }'
But fails when define a variable and put it in a file:
cat test
c=pci@1f,4000
echo | format | nawk "/$c/{print x}; {x=$0 }"
./test
nawk: syntax error at source line 1
context is
... (6 Replies)
I am unable to expand the value of entry variable inside the nawk command.
I tried three different nawk command as below but none of them substitute the value of entry variable.
ls *.txt | while IFS='' read -r entry; do
#nawk '/<name>/{A=1;++i} A{print >> ("cmd"i"_"$entry)}... (9 Replies)
Discussion started by: mohtashims
9 Replies
LEARN ABOUT DEBIAN
envstore
ENVSTORE(1) BSD General Commands Manual ENVSTORE(1)NAME
envstore -- save and restore environment variables
SYNOPSIS
envstore command [args ...]
DESCRIPTION
envstore can save and restore environment variables, thus transferring them between different shells.
command must be one of
clear
Forget all stored variables
eval
Produce shell code for evaluation, restoring all saved variables
list
List saved variables in better readable format
save variable [value]
Save variable either with its current shell value or with value
rm variable
Remove variable from store
Note: Only the first character of command is checked, so envstore e instead of envstore eval, envstore c for envstore clear, etc., are also
valid.
ENVIRONMENT
ENVSTORE_FILE The file in which the environment parameters are stored, /tmp/envstore-EUID by default,
LIMITATIONS
Variable names or values must not contain null bytes or newlines.
Due to limitations imposed by most shells, it is not possible to save parameters containing more than one consecutive whitespace. envstore
will save and display them correctly, but unless you do IFS trickery, your shell will not be able to load them.
The current maximum length (in bytes) is 255 bytes for the variable name and 1023 bytes for its content.
AUTHOR
envstore was written by Daniel Friesel <derf@derf.homelinux.org>.
Original idea and script by Maximilian Gass <mxey@ghosthacking.net>.
SEE ALSO envify(1)BSD December 1, 2009 BSD