Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Eric Blake
On 12/02/2010 07:02 PM, Clark J. Wang wrote: >> The output from the first command in the pipeline does not end with a >> newline. Therefore, 'read' in the second command returns 'failure' >> (non-zero) when it reads the first line of input, and your loop never >> iterates. > > But is that reasona

Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Clark J. Wang
On Thu, Dec 2, 2010 at 11:49 PM, Greg Wooledge wrote: > On Thu, Dec 02, 2010 at 07:04:57PM +0800, Clark J. Wang wrote: > > Following command also prints nothing, confused :( > > > > for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | while read v; do > echo > > $v; done > > The output from the f

Re: echo "${HOME#$*/}" segfaults

2010-12-02 Thread Chet Ramey
On 11/30/10 8:43 PM, David Rochberg wrote: > Bash Version: 4.1 > Patch Level: 5 > Release Status: release > > Description: > > echo "${HOME#$*/}" segfaults Thanks for the report. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - H

Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread William Park
On Thu, Dec 02, 2010 at 11:33:24AM -0500, Greg Wooledge wrote: > On Thu, Dec 02, 2010 at 09:29:29AM -0700, Eric Blake wrote: > > On 12/02/2010 04:04 AM, Clark J. Wang wrote: > > > Following command also prints nothing, confused :( > > > > > > for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | wh

Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Greg Wooledge
On Thu, Dec 02, 2010 at 09:29:29AM -0700, Eric Blake wrote: > On 12/02/2010 04:04 AM, Clark J. Wang wrote: > > Following command also prints nothing, confused :( > > > > for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | while read v; do echo > > $v; done > > http://www.faqs.org/faqs/unix-faq/s

Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Andreas Schwab
"Clark J. Wang" writes: > Following command also prints nothing, confused :( > > for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | while read v; do echo > $v; done $ printf . | { read v; echo $?; } 1 Andreas. -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942

Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Greg Wooledge
On Thu, Dec 02, 2010 at 07:04:57PM +0800, Clark J. Wang wrote: > Following command also prints nothing, confused :( > > for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | while read v; do echo > $v; done The output from the first command in the pipeline does not end with a newline. Therefore,

Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Roman Rakus
On 12/02/2010 12:04 PM, Clark J. Wang wrote: Following command also prints nothing, confused :( for ((i = 0; i< 10; ++i)); do echo -n " $i"; done | while read v; do echo $v; done read wants to read one line, but you don't end your line. try this two examples: $ printf '1 2 3 4' | while read v

Re: Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Eric Blake
On 12/02/2010 04:04 AM, Clark J. Wang wrote: > Following command also prints nothing, confused :( > > for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | while read v; do echo > $v; done http://www.faqs.org/faqs/unix-faq/shell/bash/ FAQ E4. -- Eric Blake ebl...@redhat.com+1-801-349-2682

Why `echo -n hello | while read v; do echo $v; done' prints nothing?

2010-12-02 Thread Clark J. Wang
Following command also prints nothing, confused :( for ((i = 0; i < 10; ++i)); do echo -n " $i"; done | while read v; do echo $v; done -- Clark