reading file into array
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From: Janis Papanagnou on 30 Apr 2010 11:42 Teemu Likonen wrote: > * 2010-04-30 17:12 (+0200), Janis Papanagnou wrote: > >> Either switch to a shell where that is not the case, e.g. original >> Kornshells, or hack some workaround, like enclosing the relevant >> parts in a compound command by using brackets; > > Or switch the order of processes: > > #!/bin/bash > i=0 > while read -r line; do > input[i++]=$line > done < <(grep car "$myfile") Yes. In case that your shell (and OS) supports process substitution. Janis
From: Javier Montoya on 30 Apr 2010 11:55 On Apr 30, 5:42 pm, Janis Papanagnou <janis_papanag...(a)hotmail.com> wrote: > Teemu Likonen wrote: > > * 2010-04-30 17:12 (+0200), Janis Papanagnou wrote: > > >> Either switch to a shell where that is not the case, e.g. original > >> Kornshells, or hack some workaround, like enclosing the relevant > >> parts in a compound command by using brackets; > > > Or switch the order of processes: > > > #!/bin/bash > > i=0 > > while read -r line; do > > input[i++]=$line > > done < <(grep car "$myfile") > > Yes. In case that your shell (and OS) supports process substitution. > > Janis Hi guys, Thanks for the whole support! Best wishes
From: pk on 30 Apr 2010 12:03 Javier Montoya wrote: > Dear all, > > I've the following script below to read a given file. When I try to > access a given element, once the loop has finished, the array seems to > be empty. Any suggestions on that? > > i=0 > input=[] You've got good answer for the variable in subshell problems - just note that the above is not how you initialize an array. In bash, you do either declare -a input or input=() (though I think strictly speaking they're slightly different)
From: Chris F.A. Johnson on 30 Apr 2010 17:11
On 2010-04-30, Javier Montoya wrote: > I've the following script below to read a given file. When I try to > access a given element, once the loop has finished, the array seems to > be empty. Any suggestions on that? > > i=0 > input=[] > grep "car" ${myfile} | while read line; do > input[i]="$line"; > echo ${input[$i]} > i=$((i + 1)) > done > echo ${input[0]} IFS=' ' input=( $( grep car "$myfile" ) ) -- Chris F.A. Johnson, author <http://shell.cfajohnson.com/> =================================================================== Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress) Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress) ===== My code in this post, if any, assumes the POSIX locale ===== ===== and is released under the GNU General Public Licence ===== |