/bin/bash echo "This scripts checks the existence of the messages file." echo "Checking..." if [ -f /var/log/messages ] then echo "/var/log/messages exists." fi echo echo "...done." anny ~> ./msgcheck.sh This s
[ -S FILE ] 如果 FILE 存在且是一个套接字则为真。 [ FILE1 -nt FILE2 ] 如果 FILE1 has been changed more recently than FILE2, or 如果 FILE1FILE2 does not则为真。 exists and [ FILE1 -ot FILE2 ] 如果 FILE1 比 FILE2 要老, 或者 FILE2 存在且 FILE1 不存在则为真。 [ FILE1 -...
if [ ! -z err−o!−eapk ]; then 会报出-e无法找到的错误; 而if [ ! -z err]||[!−eapk ]; then 没问题; 整数比较 : -eq 等于,如:if [ "a"−eq"b" ] -ne 不等于,如:if [ "a"−ne"b" ] -gt 大于,如:if [ "a"−gt"b" ] -ge 大于等于,如:if [ "a"−ge...
[ -S FILE ] 如果 FILE 存在且是一个套接字则为真。 [ FILE1 -nt FILE2 ] 如果 FILE1 has been changed more recently than FILE2, or 如果 FILE1FILE2 does not则为真。 exists and [ FILE1 -ot FILE2 ] 如果 FILE1 比 FILE2 要老, 或者 FILE2 存在且 FILE1 不存在则为真。 [ FILE1 -...
2. Checking if the File Is Executable In Linux systems, we should look up thexbit of the file.Let’s do that with thelscommand: $ ls -all a.out -rwxrwxr-x. 1 joe joe 24072 May 12 10:35 a.out We found, reading thexbits, that the filea.outmay be executed by its owner,joe...
Write a Bash script that defines functions for basic file operations like creating a file, deleting a file, and checking if a file exists. Pass file names as arguments to these functions.Code:#!/bin/bash # Function to create a directory create_directory() { local dirname="$1" mkdir -p...
echo -n "Checking if application exists... "$ if [ -d "/Applications/Install OS X Yosemite.app" ] $ then$ echo "Application is already downloaded and ready to continue."$ sleep 4$ break$ elif [ -f "$script_dir\Yosemite.tar.gz" ]$ ...
sbopkg, slackpkg, slapt-{get,src}: Use shorter form of the check if file exists. (3388314) rmmod: Add option completions. (47c49db) testsuite/generate: Generate less linefeeds. (068e422) insmod: Install for insmod.static too. (d02b4e1) mplayer: Add -monitoraspect arg completion. (a90...
python,perl（面向过程） 面向对象：shell，c 面向对象：JAVA，Python，perl，C++ bash:...
/bin/bash echo "This scripts checks the existence of the messages file." echo "Checking..." if [ -f /var/log/messages ] then echo "/var/log/messages exists." fi echo echo "...done." anny ~> ./msgcheck.sh This scripts checks the existence of the messages file. Checking... /...