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author | Tom Ryder <tom@sanctum.geek.nz> | 2017-04-05 20:06:39 +1200 |
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committer | Tom Ryder <tom@sanctum.geek.nz> | 2017-04-05 20:46:47 +1200 |
commit | c8ab406749124d2e762ad5cf53963070113afd0f (patch) | |
tree | 54c9721a06957ebe7098a211eea803b0230c0f5d /bin/clwr.sh | |
parent | Handle POSIX correctness in ~/.bash_profile (diff) | |
download | dotfiles-c8ab406749124d2e762ad5cf53963070113afd0f.tar.gz dotfiles-c8ab406749124d2e762ad5cf53963070113afd0f.zip |
Apply runtime shebanging to POSIX shell
Diffstat (limited to 'bin/clwr.sh')
-rw-r--r-- | bin/clwr.sh | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/bin/clwr.sh b/bin/clwr.sh new file mode 100644 index 00000000..897c1a01 --- /dev/null +++ b/bin/clwr.sh @@ -0,0 +1,23 @@ +# Write lines of terminal input into a file, clearing in between each one +self=clwr + +# Check our inputs for sanity +if [ "$#" -ne 1 ] ; then + printf >&2 '%s: Need output file\n' "$self" + exit 2 +elif ! [ -t 0 ] ; then + printf >&2 '%s: stdin not a terminal\n' "$self" + exit 2 +elif ! [ -t 1 ] ; then + printf >&2 '%s: stdout not a terminal\n' "$self" + exit 2 +fi + +# Open a file descriptor onto the output file to save on open(2)/close(2) +# system calls +exec 3>"$1" || exit + +# Start looping through clearing and accepting lines +while { tput clear && IFS= read -r line ; } ; do + printf '%s\n' "$line" >&3 +done |