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Shell Programming and Scripting
Evaluate Variable At Runtime
Post 302835239 by vidyadhar85 on Monday 22nd of July 2013 06:01:16 AM
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I have variables:
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I'd like to be able to evaluate the variable named as the value of $BAR.
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echo $BAR
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This is what I'd like to do:
echo ${$BAR} (this won't work)
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How to evaluate the value of a variable ?
For example:
a=var
$a=value !!!error happens!!!
I want to evaluate var=value, how to realize it?
Thanks!
---------- Post updated at 03:37 AM ---------- Previous update was at 02:22 AM ----------
I am using linux bash.
a=var
$a=value... (4 Replies)
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Hi There,
var1=value1
var2=value2
var3=value3
for (( i=1; i<4; i++ ))
do
temp=var$i
echo "$temp"
done
OUTPUT
var1
var2
var3
I want the output to be
value1
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LEARN ABOUT DEBIAN
fspy
fspy(1) User Commands fspy(1) NAME
fspy - filesystem activity monitoring tool SYNOPSIS
fspy [options] [file/dir] OPTIONS
-F, --filter STRING/REGEX a string or regular expression which will be used to filter the output. (the regex will be matched against the whole path e.g. [/etc/passwd]) -I, --inverted STRING/REGEX its the same like -F/--filter but inverted. you can combine both. e.g. -F '.conf' -I 'wvdial.conf' will filter for files with ".conf" in its name but without "wvdial.conf" in it. -R, --recursive NUMBER enables the recursive engine to look at a depth of NUMBER. -A, --adaptive (HIGHLY-EXPERIMENTAL) enables the adaptive mode. e.g. if new items will be added within the path fspy will automatically add those items to the watch list. -D, --diff VALUE (EXPERIMENTAL) enables the diffing feature. VALUE may be a comma separated list of: s - element size (byte) A - last access time (e.g. Mon Jul 21 21:32:31 2008) M - last modification time (e.g. Mon Jul 21 21:32:31 2008) S - last status change time (e.g. Mon Jul 21 21:32:31 2008) O - permissions (octal) U - owner (uid) G - group (gid) I - inode number D - device id -T, --type VALUE specifies the type of objects to look for. VALUE may be a comma separated list of: f - regular file d - directory s - symlink p - FIFO/pipe c - character device b - block device o - socket default is any. -O, --output VALUE specifies output format. VALUE may be a comma separated list of: f - filename p - path d - access description t - element type s - element size (byte) w - watch descriptor (inotify manpage) c - cookie (inotify manpage) m - access mask (inotify manpage | src/fsev- ents.h) l - len (inotify manpage) A - last access time (e.g. Mon Jul 21 21:32:31 2008) M - last modification time (e.g. Mon Jul 21 21:32:31 2008) S - last status change time (e.g. Mon Jul 21 21:32:31 2008) O - permissions (octal) U - owner (uid) G - group (gid) I - inode number D - device id T - date and time (for this event) (e.g. Tue Mar 25 09:23:16 CET 2008) e.g.: '[,T,], ,d,:,p,f' would result in: '[Mon Sep 1 12:31:25 2008] file was opened:/etc/passwd' (take a look at the README). -h, --help this short help. --version version information. AUTHOR
fspy is Copyright 2008-2009, Richard Sammet This manual page was written by Giuseppe Iuculano <giuseppe@iuculano.it>, for the Debian project (but may be used by others). fspy 0.1.0 January 2009 fspy(1)