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-rw-r--r--examples/scripts/bcalc104
-rw-r--r--examples/scripts/cat.sh12
-rw-r--r--examples/scripts/center41
-rw-r--r--examples/scripts/inpath19
-rw-r--r--examples/scripts/shprompt153
-rw-r--r--examples/scripts/spin.bash37
-rw-r--r--examples/scripts/xterm_title44
-rw-r--r--examples/scripts/zprintf43
8 files changed, 453 insertions, 0 deletions
diff --git a/examples/scripts/bcalc b/examples/scripts/bcalc
new file mode 100644
index 0000000..bc7e2b4
--- /dev/null
+++ b/examples/scripts/bcalc
@@ -0,0 +1,104 @@
+#! /bin/bash
+#
+# bcalc - a coproc example that uses bc to evaluate floating point expressions
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# If supplied command-line arguments, it uses them as the expression to have
+# bc evaluate, and exits after reading the result. Otherwise, it enters an
+# interactive mode, reading expressions and passing them to bc for evaluation,
+# with line editing and history.
+#
+# You could even use this to write bc programs, but you'd have to rework the
+# single-line REPL a little bit to do that (and get over the annoying timeout
+# on the read)
+#
+# Chet Ramey
+# chet.ramey@case.edu
+
+# we force stderr to avoid synchronization issues on calculation errors, even
+# with the read timeout
+init()
+{
+ coproc BC { bc -q 2>&1; }
+ # set scale
+ printf "scale = 10\n" >&${BC[1]}
+ # bash automatically sets BC_PID to the coproc pid; we store it so we
+ # can be sure to use it even after bash reaps the coproc and unsets
+ # the variables
+ coproc_pid=$BC_PID
+}
+
+# not strictly necessary; the pipes will be closed when the program exits
+# but we can use it in reset() below
+fini()
+{
+ eval exec "${BC[1]}>&- ${BC[0]}<&-"
+}
+
+reset()
+{
+ fini # close the old pipes
+
+ sleep 1
+ kill -1 $coproc_pid >/dev/null 2>&1 # make sure the coproc is dead
+ unset coproc_pid
+
+ init
+}
+
+# set a read timeout of a half second to avoid synchronization problems
+calc()
+{
+ printf "%s\n" "$1" >&${BC[1]}
+ read -t 0.5 ANSWER <&${BC[0]}
+}
+
+init
+
+# if we have command line options, process them as a single expression and
+# print the result. we could just run `bc <<<"scale = 10 ; $*"' and be done
+# with it, but we init the coproc before this and run the calculation through
+# the pipes in case we want to do something else with the answer
+
+if [ $# -gt 0 ] ; then
+ calc "$*"
+ printf "%s\n" "$ANSWER"
+ fini
+ exit 0
+fi
+
+# we don't want to save the history anywhere
+unset HISTFILE
+
+while read -e -p 'equation: ' EQN
+do
+ case "$EQN" in
+ '') continue ;;
+ exit|quit) break ;;
+ reset) reset ; continue ;;
+ esac
+
+ # save to the history list
+ history -s "$EQN"
+
+ # run it through bc
+ calc "$EQN"
+ if [ -n "$ANSWER" ] ; then
+ printf "%s\n" "$ANSWER"
+ fi
+done
+fini
+
+exit 0
diff --git a/examples/scripts/cat.sh b/examples/scripts/cat.sh
new file mode 100644
index 0000000..3e65b3f
--- /dev/null
+++ b/examples/scripts/cat.sh
@@ -0,0 +1,12 @@
+shcat()
+{
+ while read -r ; do
+ printf "%s\n" "$REPLY"
+ done
+}
+
+if [ -n "$1" ]; then
+ shcat < "$1"
+else
+ shcat
+fi
diff --git a/examples/scripts/center b/examples/scripts/center
new file mode 100644
index 0000000..dbe6133
--- /dev/null
+++ b/examples/scripts/center
@@ -0,0 +1,41 @@
+#! /bin/bash
+#
+# center - center a group of lines
+#
+# tabs in the lines might cause this to look a little bit off
+#
+#
+# Chet Ramey <chet.ramey@case.edu>
+#
+# Copyright 1999 Chester Ramey
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# TThis program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+width=${COLUMNS:-80}
+
+if [[ $# == 0 ]]
+then
+ set -- /dev/stdin
+fi
+
+for file
+do
+ while read -r
+ do
+ printf "%*s\n" $(( (width+${#REPLY})/2 )) "$REPLY"
+ done < $file
+done
+
+exit 0
diff --git a/examples/scripts/inpath b/examples/scripts/inpath
new file mode 100644
index 0000000..95f28bc
--- /dev/null
+++ b/examples/scripts/inpath
@@ -0,0 +1,19 @@
+#! /bin/sh
+#
+# Search $PATH for a file the same name as $1; return TRUE if found.
+#
+
+command=$1
+[ -n "$command" ] || exit 1
+
+set `echo $PATH | sed 's/^:/.:/
+ s/::/:.:/g
+ s/:$/:./
+ s/:/ /g'`
+
+while [ $# -ne 0 ] ; do
+ [ -f $1/$command ] && exit 0 # test -x not universal
+ shift
+done
+
+exit 1
diff --git a/examples/scripts/shprompt b/examples/scripts/shprompt
new file mode 100644
index 0000000..098c45f
--- /dev/null
+++ b/examples/scripts/shprompt
@@ -0,0 +1,153 @@
+#
+# shprompt -- give a prompt and get an answer satisfying certain criteria
+#
+# shprompt [-dDfFsy] prompt
+# s = prompt for string
+# f = prompt for filename
+# F = prompt for full pathname to a file or directory
+# d = prompt for a directory name
+# D = prompt for a full pathname to a directory
+# y = prompt for y or n answer
+#
+# Chet Ramey
+# chet@ins.CWRU.Edu
+#
+# Copyright 2002 Chester Ramey
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# TThis program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+type=file
+
+OPTS=dDfFsy
+
+succeed()
+{
+ echo "$1"
+ exit 0
+}
+
+while getopts "$OPTS" c
+do
+ case "$c" in
+ s) type=string
+ ;;
+ f) type=file
+ ;;
+ F) type=path
+ ;;
+ d) type=dir
+ ;;
+ D) type=dirpath
+ ;;
+ y) type=yesno
+ ;;
+ ?) echo "usage: $0 [-$OPTS] prompt" 1>&2
+ exit 2
+ ;;
+ esac
+done
+
+if [ "$OPTIND" -gt 1 ] ; then
+ shift $(( $OPTIND - 1 ))
+fi
+
+while :
+do
+ case "$type" in
+ string)
+ echo -n "$1" 1>&2
+ read ans || exit 1
+ if [ -n "$ans" ] ; then
+ succeed "$ans"
+ fi
+ ;;
+ file|path)
+ echo -n "$1" 1>&2
+ read ans || exit 1
+ #
+ # use `fn' and eval so that bash will do tilde expansion for
+ # me
+ #
+ eval fn="$ans"
+ case "$fn" in
+ /*) if test -e "$fn" ; then
+ succeed "$fn"
+ else
+ echo "$0: '$fn' does not exist" 1>&2
+ fi
+ ;;
+ *) if [ "$type" = "path" ] ; then
+ echo "$0: must give full pathname to file" 1>&2
+ else
+ if test -e "$fn" ; then
+ succeed "$fn"
+ else
+ echo "$0: '$fn' does not exist" 1>&2
+ fi
+ fi
+ ;;
+ esac
+ ;;
+ dir|dirpath)
+ echo -n "$1" 1>&2
+ read ans || exit 1
+ #
+ # use `fn' and eval so that bash will do tilde expansion for
+ # me
+ #
+ eval fn="$ans"
+ case "$fn" in
+ /*) if test -d "$fn" ; then
+ succeed "$fn"
+ elif test -e "$fn" ; then
+ echo "$0 '$fn' is not a directory" 1>&2
+ else
+ echo "$0: '$fn' does not exist" 1>&2
+ fi
+ ;;
+ *) if [ "$type" = "dirpath" ] ; then
+ echo "$0: must give full pathname to directory" 1>&2
+ else
+ if test -d "$fn" ; then
+ succeed "$fn"
+ elif test -e "$fn" ; then
+ echo "$0 '$fn' is not a directory" 1>&2
+ else
+ echo "$0: '$fn' does not exist" 1>&2
+ fi
+ fi
+ ;;
+ esac
+ ;;
+ yesno)
+ echo -n "$1" 1>&2
+ read ans || exit 1
+ case "$ans" in
+ y|Y|[yY][eE][sS])
+ succeed "yes"
+ ;;
+ n|N|[nN][oO])
+ succeed "no"
+ exit 0
+ ;;
+ *)
+ echo "$0: yes or no required" 1>&2
+ ;;
+ esac
+ ;;
+ esac
+done
+
+exit 1
diff --git a/examples/scripts/spin.bash b/examples/scripts/spin.bash
new file mode 100644
index 0000000..9fa9125
--- /dev/null
+++ b/examples/scripts/spin.bash
@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+# spin.bash -- provide a `spinning wheel' to show progress
+#
+# Chet Ramey
+# chet@po.cwru.edu
+#
+# Copyright 1997 Chester Ramey
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# TThis program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+bs=$'\b'
+
+chars="|${bs} \\${bs} -${bs} /${bs}"
+
+# Infinite loop for demo. purposes
+while :
+do
+ for letter in $chars
+ do
+ echo -n ${letter}
+ done
+done
+
+exit 0
diff --git a/examples/scripts/xterm_title b/examples/scripts/xterm_title
new file mode 100644
index 0000000..839003f
--- /dev/null
+++ b/examples/scripts/xterm_title
@@ -0,0 +1,44 @@
+#! /bin/bash
+#
+# xterm_title - print the contents of the xterm title bar
+#
+# Derived from http://www.clark.net/pub/dickey/xterm/xterm.faq.html#how2_title
+#
+
+# Copyright 1997 Chester Ramey
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# TThis program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+P=${0##*/}
+[ -z "$DISPLAY" ] && {
+ echo "${P}: not running X" >&2
+ exit 1
+}
+
+if [ -z "$TERM" ] || [ "$TERM" != "xterm" ]; then
+ echo "${P}: not running in an xterm" >&2
+ exit 1
+fi
+
+exec </dev/tty
+old=$(stty -g)
+stty raw -echo min 0 time ${1-10}
+echo -e "\033[21t\c" > /dev/tty
+IFS='' read -r a
+stty $old
+b=${a#???}
+echo "${b%??}"
+
+exit 0
diff --git a/examples/scripts/zprintf b/examples/scripts/zprintf
new file mode 100644
index 0000000..86f9e95
--- /dev/null
+++ b/examples/scripts/zprintf
@@ -0,0 +1,43 @@
+#! /bin/bash
+#
+# zprintf - function that calls gawk to do printf for those systems that
+# don't have a printf executable
+#
+# The format and arguments can have trailing commas, just like gawk
+#
+# example:
+# zprintf 'Eat %x %x and suck %x!\n' 57005 48879 64206
+#
+# Chet Ramey
+# chet@po.cwru.edu
+
+# Copyright 1996 Chester Ramey
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# TThis program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+[ $# -lt 1 ] && {
+ echo "zprintf: usage: zprintf format [args ...]" >&2
+ exit 2
+}
+
+fmt="${1%,}"
+shift
+
+for a in "$@"; do
+ args="$args,\"${a%,}\""
+done
+
+gawk "BEGIN { printf \"$fmt\" $args }"