Linux 多进度条
除了我之前关于shell脚本中多线程的查询外,我还想知道是否可能有多个进度条 以下是我预期结果的代码片段:Linux 多进度条,linux,multithreading,bash,unix,progress-bar,Linux,Multithreading,Bash,Unix,Progress Bar,除了我之前关于shell脚本中多线程的查询外,我还想知道是否可能有多个进度条 以下是我预期结果的代码片段: Output : 1 of 100 Files Completed # Thread1 Output : 10 of 45 files Completed # Thread 2 显示进度的行已更新。是否可以在shell中实现它?就像-c所做的那样 当然,看。虽然它不是仅从shell就可以安全地实现,但是一个小型的C实用程序可以处理它。就像-C所做的那样 当然,看。虽
Output : 1 of 100 Files Completed # Thread1
Output : 10 of 45 files Completed # Thread 2
显示进度的行已更新。是否可以在shell中实现它?就像-c
所做的那样
当然,看。虽然它不是仅从shell就可以安全地实现,但是一个小型的C实用程序可以处理它。就像-C
所做的那样
当然,看。虽然仅在shell中并不安全,但是一个小型的C实用程序可以处理它。是的,这是非常有可能的 假设您现有的代码(基于您以前的帖子)当前是这样的:
do_something() {
...
echo -ne "\r$index of $No_of_Files Completed"
...
}
do_something A &
do_something B &
do_something C &
wait
…然后您可以执行以下调整,以达到您心目中的效果:
# Background tasks will no longer write directly to the console; instead,
# they will write to temporary files which will be read periodically
# by a special log printer task (which will display everything nicely.)
#
# Name of temporary files
STATUS_BASENAME="/tmp/~$$.status"
# Process IDs of backgrounded tasks; we record them so we can wait on them
# specifically but not wait on the special log printer task
TASK_PIDS=""
do_something() {
# First parameter must be a task ID starting at 0 incremented by 1
TASK_ID=$1 ; shift
...
# We write new status to status file (note we don't echo -n, we want that
# trailing newline)
# Try to go through a temporary status file which we rename afterwards to
# avoid race conditions with the special log printer task
echo "$x of 5 Completed" >"${STATUS_BASENAME}.${TASK_ID}.tmp"
mv "${STATUS_BASENAME}.${TASK_ID}.tmp" "${STATUS_BASENAME}.${TASK_ID}"
...
}
# Special log printer task
status_printer() {
# First time in the loop is special insofar we don't have to
# scroll up to overwrite previous output.
FIRST_TIME=1
while true ; do
# If not first time, scroll up as many lines as we have
# regular background tasks to overwrite previous output.
test $FIRST_TIME -eq 0 && for PID in $TASK_PIDS ; do
echo -ne '\033M' # scrol up one line using ANSI/VT100 cursor control sequences
done
FIRST_TIME=0
TASK_ID=0
for PID in $TASK_PIDS ; do
# If status file exists print first line
test -f "${STATUS_BASENAME}.${TASK_ID}" && head -1 "${STATUS_BASENAME}.${TASK_ID}" || echo "waiting..."
TASK_ID=`expr $TASK_ID + 1` # using expr for portability :)
done
test -f "${STATUS_BASENAME}.done" && return
sleep 1 # seconds to wait between updates
done
}
do_something 0 A &
TASK_PIDS="$TASK_PIDS $!"
do_something 1 B &
TASK_PIDS="$TASK_PIDS $!"
do_something 2 C &
TASK_PIDS="$TASK_PIDS $!"
status_printer &
PRINTER_PID=$!
# Wait for background tasks
wait $TASK_PIDS
# Stop special printer task instead of doing just
# kill $PRINTER_PID >/dev/null
touch "${STATUS_BASENAME}.done"
wait $PRINTER_PID
# Cleanup
rm -f "${STATUS_BASENAME}."*
是的,很有可能 假设您现有的代码(基于您以前的帖子)当前是这样的:
do_something() {
...
echo -ne "\r$index of $No_of_Files Completed"
...
}
do_something A &
do_something B &
do_something C &
wait
…然后您可以执行以下调整,以达到您心目中的效果:
# Background tasks will no longer write directly to the console; instead,
# they will write to temporary files which will be read periodically
# by a special log printer task (which will display everything nicely.)
#
# Name of temporary files
STATUS_BASENAME="/tmp/~$$.status"
# Process IDs of backgrounded tasks; we record them so we can wait on them
# specifically but not wait on the special log printer task
TASK_PIDS=""
do_something() {
# First parameter must be a task ID starting at 0 incremented by 1
TASK_ID=$1 ; shift
...
# We write new status to status file (note we don't echo -n, we want that
# trailing newline)
# Try to go through a temporary status file which we rename afterwards to
# avoid race conditions with the special log printer task
echo "$x of 5 Completed" >"${STATUS_BASENAME}.${TASK_ID}.tmp"
mv "${STATUS_BASENAME}.${TASK_ID}.tmp" "${STATUS_BASENAME}.${TASK_ID}"
...
}
# Special log printer task
status_printer() {
# First time in the loop is special insofar we don't have to
# scroll up to overwrite previous output.
FIRST_TIME=1
while true ; do
# If not first time, scroll up as many lines as we have
# regular background tasks to overwrite previous output.
test $FIRST_TIME -eq 0 && for PID in $TASK_PIDS ; do
echo -ne '\033M' # scrol up one line using ANSI/VT100 cursor control sequences
done
FIRST_TIME=0
TASK_ID=0
for PID in $TASK_PIDS ; do
# If status file exists print first line
test -f "${STATUS_BASENAME}.${TASK_ID}" && head -1 "${STATUS_BASENAME}.${TASK_ID}" || echo "waiting..."
TASK_ID=`expr $TASK_ID + 1` # using expr for portability :)
done
test -f "${STATUS_BASENAME}.done" && return
sleep 1 # seconds to wait between updates
done
}
do_something 0 A &
TASK_PIDS="$TASK_PIDS $!"
do_something 1 B &
TASK_PIDS="$TASK_PIDS $!"
do_something 2 C &
TASK_PIDS="$TASK_PIDS $!"
status_printer &
PRINTER_PID=$!
# Wait for background tasks
wait $TASK_PIDS
# Stop special printer task instead of doing just
# kill $PRINTER_PID >/dev/null
touch "${STATUS_BASENAME}.done"
wait $PRINTER_PID
# Cleanup
rm -f "${STATUS_BASENAME}."*
如果您的子流程输出是可过滤的,那么您可以将每个子流程的stdout重定向到不同的文件描述符,然后调用函数来循环该文件描述符的输出。然后您可以尝试使用printf更新进度表。这就是你会遇到麻烦的地方。不确定Bash的内置printf是否能够处理终端的细节。我从未尝试在Bash中编写一个可以进行多行输出的进度表。为什么不使用对话框?如果您的子流程输出是可过滤的,那么您可以将每个子流程的标准输出重定向到不同的文件描述符,然后调用函数循环该文件描述符的输出。然后您可以尝试使用printf更新进度表。这就是你会遇到麻烦的地方。不确定Bash的内置printf是否能够处理终端的细节。我从未尝试在Bash中编写一个可以进行多行输出的进度表。为什么不使用dialog?shell中的printf语句是否可以使用不同的转义字符\n\r等?不太可能。如何防止两个线程同时向终端写入数据,并将线路弄乱?你必须使用ANSI转义来设置光标在一条线上的位置。是的,这就是我所看到的。如果可以,请单独使用shell脚本。。我知道,我期望太高了。。如果我能做到这一点就太好了..是否可以在shell中使用具有不同转义字符的printf语句\n\r等..不太可能。如何防止两个线程同时向终端写入数据,并将线路弄乱?你必须使用ANSI转义来设置光标在一条线上的位置。是的,这就是我所看到的。如果可以,请单独使用shell脚本。。我知道,我期望太高了。。如果我能做到那就太好了。非常感谢您抽出时间来开发这段代码。。如果它符合我的框架,我会尝试这个。我在想,是否有什么明显的方法可以结合使用echo和printf语句。感谢您的帮助非常感谢您抽出时间来开发此代码。。如果它符合我的框架,我会尝试这个。我在想,是否有什么明显的方法可以结合使用echo和printf语句。谢谢你的帮助