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Homework and Emergencies Emergency UNIX and Linux Support Bash - command substution not working Post 302926334 by sreyan32 on Sunday 23rd of November 2014 12:51:58 PM
Old 11-23-2014
Bash - command substution not working

For some reason I cannot use command substitution in my bash shell in Fedora.

Code:
 
 The following commands give me the following outputs-:
  
 [Sreyan@localhost ~]$ $(( $(w| wc -l) - 2 ))
Command not found. 
 
[Sreyan@localhost ~]$ `ls`
Command not found. 
 
[Sreyan@localhost ~]$ $("date")
Command not found. 
 [Sreyan@localhost ~]$ $(ls)
Command not found. 
 [Sreyan@localhost ~]$ $(( $(date +%s) / 86400 ))
Command not found.

What am I doing wrong ? I cannot complete my assignments without command substitution. That's why I am posting here. I am on Fedora 14 32bit.
 

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ntptrace(1M)						  System Administration Commands					      ntptrace(1M)

NAME
ntptrace - trace a chain of NTP hosts back to their master time source SYNOPSIS
/usr/sbin/ntptrace [-vdn] [-r retries] [-t timeout] [server] DESCRIPTION
ntptrace determines where a given Network Time Protocol (NTP) server gets its time from, and follows the chain of NTP servers back to their master time source. If given no arguments, it starts with localhost. OPTIONS
The following options are supported: -d Turns on some debugging output. -n Turns off the printing of host names; instead, host IP addresses are given. This may be necessary if a nameserver is down. -r retries Sets the number of retransmission attempts for each host. -t timeout Sets the retransmission timeout (in seconds); default = 2. -v Prints verbose information about the NTP servers. EXAMPLES
Example 1: Sample Output From the ntptrace Command The following example shows the output from the ntptrace command: % ntptrace localhost: stratum 4, offset 0.0019529, synch distance 0.144135 server2.bozo.com: stratum 2, offset 0.0124263, synch distance 0.115784 usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB' On each line, the fields are (left to right): o The server's host name o The server's stratum o The time offset between that server and the local host (as measured by ntptrace; this is why it is not always zero for localhost) o The host's synchronization distance o The reference clock ID (only for stratum-1 servers) All times are given in seconds. Synchronization distance is a measure of the goodness of the clock's time. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWntpu | +-----------------------------+-----------------------------+ SEE ALSO
xntpd(1M), attributes(5) BUGS
This program makes no attempt to improve accuracy by doing multiple samples. SunOS 5.10 19 Mar 1998 ntptrace(1M)
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