README: improve error checking for temporary files in examples - sfeed - RSS and Atom parser
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       ---
 (DIR) commit f11a83207e85e9007cf908a50318d50ef1e7bab9
 (DIR) parent 15d18283616a951f060daf8f96996def532b8e21
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Thu,  6 Apr 2023 20:22:00 +0200
       
       README: improve error checking for temporary files in examples
       
       Similar to the recent fix for sfeed_update in commit
       5a27c58675ddf4113d64a84f715cb3fecb681a6d
       
       Diffstat:
         M README                              |       8 ++++----
       
       1 file changed, 4 insertions(+), 4 deletions(-)
       ---
 (DIR) diff --git a/README b/README
       @@ -742,9 +742,9 @@ sfeed_update_xargs shellscript:
                }
                
                # fetch feeds and store in temporary directory.
       -        sfeedtmpdir="$(mktemp -d '/tmp/sfeed_XXXXXX')"
       +        sfeedtmpdir="$(mktemp -d '/tmp/sfeed_XXXXXX')" || exit 1
                mkdir -p "${sfeedtmpdir}/feeds"
       -        touch "${sfeedtmpdir}/ok"
       +        touch "${sfeedtmpdir}/ok" || exit 1
                # make sure path exists.
                mkdir -p "${sfeedpath}"
                # print feeds for parallel processing with xargs.
       @@ -841,7 +841,7 @@ arguments are specified then the data is read from stdin.
                
                # ...else parent mode:
                
       -        tmp=$(mktemp)
       +        tmp="$(mktemp)" || exit 1
                trap "rm -f ${tmp}" EXIT
                
                [ -f "${cachefile}" ] || touch "${cachefile}"
       @@ -1188,7 +1188,7 @@ Example of a `markallread.sh` shellscript to mark all URLs as read:
        
                #!/bin/sh
                # mark all items/URLs as read.
       -        tmp=$(mktemp)
       +        tmp="$(mktemp)" || exit 1
                (cat ~/.sfeed/urls; cut -f 3 ~/.sfeed/feeds/*) | \
                awk '!x[$0]++' > "$tmp" &&
                mv "$tmp" ~/.sfeed/urls &&