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Full Discussion: Inputs argument for sh -c
Top Forums Shell Programming and Scripting Inputs argument for sh -c Post 303008050 by puertas12 on Sunday 26th of November 2017 11:53:54 AM
Old 11-26-2017
Inputs argument for sh -c

I have doubts with the following command:
Code:
% find "$1" -name "*.html" -print0 | sort -zn | xargs -r -0 -n 1 sh -c 'echo "Dumping file: $2" >> "$1"; w3m "$2" >> "$1" 2>&1 ' sh "$2"

I have doubts in the input arguments value i.e. $0, $1, $2...

Step by step:
1.- % find "$1" -name "*.html" -print0 | ...
where:
- $1 is the name of the directory to search on
2.-
Code:
% ...| ... sh -c 'echo "Dumping file: $2" >> "$1"; w3m "$2" >> "$1" 2>&1' sh "$2"

where:
- $0 is sh -c
- $1 is the same as $1 in the step 1 Smilie??? Why???
- $2 is the htmlA
- $3 is the htmlB and so on with $4, $5 etc.
3.- Finally, .. sh "$2" makes a shift
The value in $3 will be now $2

Is my understanding correct? How is the value of $1 taken?


Thanks.


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by Neo; 11-26-2017 at 02:42 PM..
 

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SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME
surfraw-update-path - updates PATH in shell config files SYNOPSIS
surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL] DESCRIPTION
surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file. Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es Don't forget to login again or source your login files for it to take effect. OPTIONS
-check Checks to see if the surfraw config code is present. This is the default. -add Adds the surfraw config code. -remove Removes the surfraw config code -sys Updates the system-wide shell config instead of the user. Must be done as root. -shell=SHELL Selects the shell to configure. Defaults to the value of the $SHELL environment variable. Currently supported shells are: sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es. -all Attempts to configure the startup files for all known shells -help Gives a usage message RETURN VALUE
-check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error. All other options return 0 on success, or 2 on error. ENVIRONMENT
SHELL Used to determine which shell to configure, if -shell is not given. HOME Used to find users config files. ENV Used by posix-compliant shells to specify a startup rc file. ZDOTDIR Used to find user config files for zsh. If not set, defaults to HOME. SEE ALSO
surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1) AUTHOR
Ian Beckwith <ianb@erislabs.net> perl v5.12.4 2011-07-12 SURFRAW-UPDATE-PATH(1)
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