/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... /va...
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 -...
directory_exists function checks if a directory exists using the -d test operator. We test these functions by creating a directory, checking if it exists, and listing files in it. Bash Editor: More to Come ! Do not submit any solution of the above exercises at here, if you want to cont...
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...
/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... /...
if [ -z "$1" ]; then echo "Usage: $0 <filename>" exit 1 fi # 获取传入的文件名 filename=$1 # 检查文件是否存在 if [ -f "$filename" ]; then echo "File $filename exists." # 打印文件的内容 cat "$filename" else echo "File $filename does not exist." ...
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...
/bin/bash echo "checks the existence of the messages file." echo -n "Checking..." if [ -f /var/log/messages ];then echo "/var/log/messages exists." fi echo echo "...done." 1. 字符串比较 举例如下,比较字符串来测试用户ID :...
python,perl（面向过程） 面向对象：shell，c 面向对象：JAVA，Python，perl，C++ bash:...