How can I pass the name of the variable inside a for statment
I have a script something like below:
classA=12
classB=14
classC=16
# classD = 20
all_class="classA classB classC"
for i in $all_class
do
echo $i = $($i) #<---- this one not work
#echo $i = $(echo $i) ... (1 Reply)
hi,
i have store variable in $var i want to print it in $3 of file using awk.
how can i do it?
file :
var1,var2,var3
var5,var6,var7
var8,var9,var10
.
.
.
i want to print $var in $3 ( for example var3 or var7 or var10)
thanks (3 Replies)
Hello,
i need to redirect the output of print to a variable file name:
#This is normal
awk '{ print $17 > "output.txt" }' input
#I need something like this
awk '{ print $17 > "output_${25}.txt" }' input
how to format the output file name to contain a variable? (6 Replies)
Let's say I want to print the arguments $4 till $#, how can I do this?
$# contains the number of arguments
$@ contain all the arguments as string
What i need is something like
for i in $4_till_$#; do
#do something with $i
convert $i ~/$output
done
The first 3 arguments are used as options... (6 Replies)
I have list of files:
ls
a.pdf
b.pdf
c.pdf
and so on...
and I have a file like this:
cat file1
apple
mango
pear
and so on...
I want to rename my file like this: (7 Replies)
hey,
just want to ask how to do this.
ex.
g="hi i am john"
h=`echo $g | awk '{print $2}'`
echo $h
OUTPUT is 'i'
What if I want to use a variable instead of using '2', how do I do that?
Because this one does not work:
a=2
h=`echo $g | awk '{print ${$a}}'`
this one also does not... (3 Replies)
i have this variable:
varT="1--2--3--5"
i want to use awk to print field 3 from this variable. i dont want to do the "echo $varT".
but here's my awk code:
awk -v valA="$varT" "BEGIN {print valA}"
this prints the entire line. i feel like i'm so close to getting what i want. i... (4 Replies)
Hi guys,
I have a file "abc.dat" in below format:
FILE_PATH||||$F_PATH
TABLE_LIST||||a|b|c
SYST_NM||||${SRC_SYST}
Now I am trying to read the above file and want to print the value for above dollar variables F_PATH and SRC_SYST. The problem is it's reading the dollar variables as... (5 Replies)
The bash bash below extracts the oldest folder from a directory and stores it in filename
That result will match a line in bold in input. In the matching line there is an_xxx digit in italics that
(once the leading zero is removed) will match a line in link. That is the lint to print in output.... (2 Replies)
The file f1 contains the text "body" (shell prompt is "$"):
$ cat ~/path/f1
body
How to print contents of f1 when the f1 path is in a variable?
Here is my failed attempt:
$ f1="~/path/f1"
$ echo $f1
~/path/f1
$ cat $f1
cat: '~/path/f1': No such file or directory (2 Replies)
Discussion started by: wolfv
2 Replies
LEARN ABOUT PLAN9
gets
gets(n) Tcl Built-In Commands gets(n)
__________________________________________________________________________________________________________________________________________________NAME
gets - Read a line from a channel
SYNOPSIS
gets channelId ?varName?
_________________________________________________________________DESCRIPTION
This command reads the next line from channelId, returns everything in the line up to (but not including) the end-of-line character(s), and
discards the end-of-line character(s).
ChannelId must be an identifier for an open channel such as the Tcl standard input channel (stdin), the return value from an invocation of
open or socket, or the result of a channel creation command provided by a Tcl extension. The channel must have been opened for input.
If varName is omitted the line is returned as the result of the command. If varName is specified then the line is placed in the variable
by that name and the return value is a count of the number of characters returned.
If end of file occurs while scanning for an end of line, the command returns whatever input is available up to the end of file. If chan-
nelId is in nonblocking mode and there is not a full line of input available, the command returns an empty string and does not consume any
input. If varName is specified and an empty string is returned in varName because of end-of-file or because of insufficient data in non-
blocking mode, then the return count is -1. Note that if varName is not specified then the end-of-file and no-full-line-available cases
can produce the same results as if there were an input line consisting only of the end-of-line character(s). The eof and fblocked commands
can be used to distinguish these three cases.
EXAMPLE
This example reads a file one line at a time and prints it out with the current line number attached to the start of each line.
set chan [open "some.file.txt"]
set lineNumber 0
while {[gets $chan line] >= 0} {
puts "[incr lineNumber]: $line"
}
close $chan
SEE ALSO
file(n), eof(n), fblocked(n), Tcl_StandardChannels(3)KEYWORDS
blocking, channel, end of file, end of line, line, nonblocking, read
Tcl 7.5 gets(n)